Document:

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                                                                    EXHIBIT 10.7

                     SHELTER SERVICES AGREEMENT BETWEEN E4
                            ALIGN TECHNOLOGY, INC.
                                      AND
                            ELAMEX, S. A. de C. V.

<TABLE>
<C>  <S>                                                 <C>
 1.  Manufacturing Space...............................   2
 2.  Space Services....................................   3
 3.  Import/Export Services............................   3
 4.  Mexican Customs, Duties, Taxes and Other Charges..   4
 5.  U.  S.  Customs, Duties, Taxes and Other Charges..   5
 6.  Product Assembly..................................   5
 7.  Personnel Services and Manning Table..............   5
 8.  Invoicing and Other Charges.......................   8
 9.  Term..............................................   9
10.  Early Termination and Termination Options.........  10
11.  Warranties........................................  11
12.  Relationship of the Parties.......................  12
13.  Insurance.........................................  12
14.  Notices...........................................  13
15.  Force Majeure.....................................  14
16.  Bailment..........................................  14
17.  Arbitration.......................................  16
18.  Environmental Indemnity...........................  19
19.  Default...........................................  20
20.  Miscellaneous.....................................  20
</TABLE>
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                       SHELTER SERVICES AGREEMENT BETWEEN
                             ALIGN TECHNOLOGY, INC
                                      AND
                             ELAMEX, S. A. de C. V.

This agreement ("Agreement") made as of this 15th day of February, 2000 by Align
Technology, Inc., with principal offices at 442 Potrero Avenue (hereinafter
ALIGN) and Elamex, S.A. de C.V., a company duly incorporated in the Republic of
Mexico, with principal offices in Cd. Juarez, Chihuahua, Mexico, (hereinafter
"ELAMEX").

A. Whereas, ALIGN desires to have ELAMEX assemble products in Mexico from parts,
   materials and certain equipment supplied by ALIGN (the "Product");
   and

B. Whereas, ELAMEX desires to perform such services and maintains status as a
   Maquiladora duly authorized by the Mexican Secretary of Commerce and
   Industrial Development, and

C. Whereas, both parties warrant and represent that they are duly authorized to
   execute this Agreement, and such authorization is in full force and effect.

     Now, therefore, in consideration of the mutual covenants and obligations
hereinafter set forth, the parties agree as follows:

1.   Manufacturing Space

1.1.    ELAMEX agrees to perform the Services for ALIGN at the ELAMEX facility
        designated as Elamex Plant No. 11 located in the Fernandez Industrial
        Park, in Cd. Juarez, Chihuahua, Mexico (the "Facility"), parts,
        materials, production supplies, packaging material and certain equipment
        supplied by and belonging to ALIGN. ELAMEX shall arrange sufficient
        Facility and facility services ("Services") to enable it to assemble the
        Product. Such Facility and Services shall include, at a minimum:

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1.1.1.  A space of 7500 square feet for the assembly of the Product, warehousing
        of parts and assembled Product, offices and allocated space
        ("Space") as described in Exhibit A.

1.2.    The Facility will have at a minimum:

1.2.1.  Modern devices for the supply of heat, evaporative cooling, lighting and
        water,

1.2.2.  Industrial electrical power, and

1.2.3.  A dedicated Mexican non-toll telephone line, with extensions for the
        resident manager and his staff as well as normal office
        furnishing.

1.3.    Upon request by ALIGN for additional Services, ELAMEX shall use its best
        efforts to provide the same in an efficient manner at a fair and
        reasonable cost.

2.   Space Services

2.1.    ELAMEX shall supply the following services, at ALIGN's expense, to the
        Space;

2.1.1.  Utilities for heating, lighting and cooling;

2.1.2.  Janitorial services, including trash and refuse removal;

2.1.3.  Repair and maintenance of the Space and the Facility, and

2.1.4.  Facility security.

2.2.    All expenses will be charged to ALIGN with a mark up according to
        Exhibit B.

3.   Import/Export Services

3.1.    ELAMEX shall provide all necessary administrative services to effect
        shipment of equipment and material to and from Mexico, using the
        information supplied by ALIGN. ALIGN will supply such information in a
        timely fashion so that ELAMEX may obtain all necessary permits. Such
        administrative services shall include, but not be limited to, securing
        Mexican import permits, preparation of

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        required customs clearance papers, and all necessary trucking, handling,
        moving, and storage.

3.2.    ELAMEX will provide importation of raw materials and parts from ELAMEX'
        warehouse in E1 Paso, Texas to Mexico, and exportation of assembled
        Product to El Paso, Texas, where the carriage and insurance cost
        concerning such importation shall be paid by ALIGN according to the
        schedule attached hereto as Exhibit C.

3.3.    ALIGN will provide the trailer(s) as required. ELAMEX may rent
        trailer(s) on behalf of ALIGN, if so instructed. ALIGN shall reimburse
        such cost at the actual cost plus a markup according to Exhibit B.

4.   Mexican Customs, Duties, Taxes and Other Charges

4.1.    ELAMEX will be the importer of record for Mexican Customs purposes.

4.2.    ELAMEX shall pay all Mexican customs tariffs, duties, bonds, and Mexican
        customs brokers' charges, and any and all other charges, fees, levies,
        or assessments made pursuant to Mexican law in effect as of the
        commencement date of this Agreement, as to the importation to and
        exportation from Mexico of ALIGN's Product and/or equipment. ALIGN will
        reimburse for any expenses incurred by ELAMEX that are not included in
        the Schedule of Services detailed in Exhibit C.

4.3.    ALIGN will reimburse ELAMEX for its payment of the Mexican Derecho de
        Tramite Aduanero ("DTA") tax The DTA tax is a tax on raw materials,
        tools, machinery, equipment, accessories and spare parts imported into
        Mexico. At the present time, the DTA tax is .176% on equipment and
        $114.00 (One hundred and fourteen 00/100 pesos) per truck for parts,
        materials and assembled products.

4.4.    ALIGN shall pay all imposed Mexican inventory taxes as to ALIGN's
        Product and equipment in ELAMEX' possession at the Facility. ELAMEX
        shall substantiate such taxes.

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5.   U.  S.  Customs, Duties, Taxes and Other Charges

5.1.    ALIGN will be the importer and exporter of record for U. S. Customs'
        purposes.

5.2.    ALIGN shall pay all U. S. customs tariffs, duties, bonds, and any and
        all other charges fees, levies, or assessments made pursuant to U. S.
        Customs Code as to the importation to and exportation from the U. S. of
        ALIGN's Product and/or equipment related to this Agreement.

6.   Product Assembly

6.1.    ELAMEX agrees to instruct its personnel to assemble the Product in
        accordance with the specifications provided by ALIGN and are attached
        hereto as Exhibit F Exhibit D attached hereto is a list of the various
        items that are currently the Product. Such Exhibit D may be modified in
        writing from time to time at ALIGN's convenience. ALIGN may revise its
        specifications at any time at its sole discretion and may use its
        engineering change order control procedure or other methods of
        communication of revisions to ELAMEX. ELAMEX agrees to comply with such
        revisions or promptly notify ALIGN if it is unable to comply.

6.2.    The parties understand that the assembly process productivity and
        efficiency are the responsibility of ALIGN and will be administered by
        ALIGN through its representative. ELAMEX shall make available to ALIGN
        and to ALIGN's representative any support services in the areas of
        engineering, systems and quality assurance that ELAMEX has the resources
        to provide. The price ELAMEX will charge ALIGN for those services will
        be communicated to ALIGN before the rendering of such services.

7.   Personnel Services and Manning Table

7.1.    ELAMEX shall assign personnel to perform the transportation, receiving,
        handling and storage of parts and the assembly, packaging and shipment
        of the Product. Such personnel shall include but shall not be limited to
        assembly operators, material handlers, mechanics, quality control
        inspectors, warehousemen, test technicians and group leaders. ELAMEX
        shall also assign

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        production supervisors, superintendents and engineers to manage the
        assembly of the Product. ELAMEX shall provide overall project management
        including accounting, import/export, personnel services, quality
        control, and materials and production management. ELAMEX will use its
        best effort to ensure employee continuity. The position, numbers and
        levels shall be listed in a Manning Table similar to the example
        attached hereto as Exhibit D. The Manning Table may be modified from
        time to time by mutual agreement.

7.2.    Should fluctuation in ALIGN's production schedules require that the
        number of direct or indirect labor employees be reduced, such reduction
        may be realized through the application of any combination of the
        following procedures at ALIGN's written request:

7.2.1.  ELAMEX may use its best efforts to place the excess employees in one of
        its other operations;

7.2.2.  ALIGN may instruct ELAMEX to allow for the reduction through natural
        attrition; and/or

7.2.3.  ALIGN may instruct ELAMEX to terminate the employment of the number of
        excess employees through payment to them of legal severance.

7.3.    The parties understand that the total number of employees assigned by
        ELAMEX to ALIGN according to the terms of this Agreement will at no time
        be less than the total number indicated on the Manning Table, except
        during the ramp up period which will begin on 15, 2000 and will end on
        May 15, 2000.

7.4.    There will be no cost to ALIGN resulting from the application of the
        procedures described in paragraphs 7.2.1 and 7.2.2 herein. Should ALIGN
        opt for the application of the procedure described in 7.2.3, ALIGN shall
        pay ELAMEX the full amount of any severance benefits made under Mexican
        law. ELAMEX will notify ALIGN in writing as to the amount of such
        severance in advance of any such payments.

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7.5.    Should ALIGN's production schedules require that the number of direct or
        indirect labor employees be increased, ALIGN will notify ELAMEX in
        writing as to the number of additional personnel it will require.
        Requests for additional personnel shall not be in excess of 40 direct
        labor operators per workweek.

7.6.    Exhibit D attached hereto is a description of the employee positions,
        the skill levels and hourly rates of the direct labor, indirect labor
        and overall project management. ELAMEX will not make modifications to
        Exhibit D without ALIGN's written approval, except as provided for in
        paragraph 8.1 and/or 8.2, hereinafter.

7.7.    ELAMEX may require, at ALIGN's expense, a medical physical examination
        of all applicants before employment and will employ only those
        applicants who are physically able to perform their assigned tasks.

7.8.    All personnel hired by ELAMEX and assigned to ALIGN to perform assembly,
        supervisory and administrative services shall be paid by ELAMEX. ELAMEX
        shall maintain all accounting, administrative payroll taxes, and
        required contributions and bookkeeping records pertaining to such
        personnel. ELAMEX also will hire a nurse to be on the premises, as
        required bylaw. Neither ELAMEX nor any of its employees shall in any
        sense be considered an employee or an agent of ALIGN, nor shall ELAMEX
        employees be entitled or eligible to participate in any benefit or
        privileges given or extended by ALIGN to its employees. ALIGN agrees not
        to hire any Mexican national employees during the Term of this Agreement
        except for plant managers, which will be on ALIGN's U. S. A. payroll.

7.8.1.  Mexican national personnel employed by either by ALIGN or by a Mexican
        contractor retained by ALIGN to provide it with assembly or
        manufacturing prior to the date of execution of this Agreement, will not
        constitute a breach by ALIGN of its obligation under the terms of this
        paragraph 7.8.

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7.8.2.  After the ramp up period as defined in paragraph 7.3 hereinabove, should
        ELAMEX not comply for more than two consecutive weeks with the request
        with for additional personnel up to the maximum number of direct labor
        employees as provided for in paragraph 7.5 hereinabove, ALIGN may seek
        second source in Mexico for manufacture of the Product.

7.9.    For the following eighteen (18) months after termination, ALIGN
        covenants and agrees not to hire any of ELAMEX' active or inactive
        management employees without ELAMEX' written consent.

8.   Invoicing and Other Charges

8.1.    ALIGN shall reimburse ELAMEX any and all expenses incurred by ELAMEX in
        accordance with the terms of this Agreement, plus additional percentage
        of those expenses according to the schedule on Exhibit B.

8.2.    Invoices shall be submitted weekly by ELAMEX to ALIGN's representative
        for review and approval. A listing of all expenses for which ELAMEX
        requires reimbursement shall be attached to each invoice. ALIGN agrees
        to pay such invoices in U. S. dollars within 20 calendar days of the
        date of the invoice. ALIGN further agrees to pay ELAMEX a late payment
        charge to be calculated at the annualized rate of 18%, accruable per day
        from the date that payment is due through the date that payment is
        received by ELAMEX or ELAMEX' bank. For invoicing purposes, each week
        shall be in on Monday at 12:00 a.m. and end on Sunday at 11:59 p.m.

8.3.    All payroll and non-payroll related expenditure must be approved by one
        of ALIGN's authorized representatives. All non-payroll expenditures will
        be authorized prior to their being incurred.

8.4.

8.5.    The persons authorized by ALIGN to approve expenditures and examples of
        their respective signatures are listed and attached hereto as Exhibit E.

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8.6.    ALIGN will reimburse and pay ELAMEX all government mandated expenses
        related to any employee severance or termination in connection with any
        and all employees hired at ALIGN's discretion at the actual cost plus a
        markup according to Exhibit B.

8.7.    ALIGN further agrees to reimburse and pay ELAMEX any out-of-pocket cost
        arising from or pursuant to ELAMEX compliance with applicable laws,
        regulations, policies, rulings, directive and any other requirement
        (including ALIGN'S written requests) concerning the environment, health
        and/or safety requirements resulting from the use of certain materials
        and processes in the assembly of the Product.

8.8.    If ALIGN fails to pay timely, as required by the teams of this
        Agreement, any of its indebtedness to ELAMEX, ALIGN hereby agrees to
        assign and make over to ELAMEX all of its interest in all inventory of
        raw materials, work-in-process, and finished goods of ALIGN, while the
        same are on the premises of the Facility or otherwise under the control
        or possession of ELAMEX, in order to secure all present and future
        indebtedness of ALIGN to ELAMEX ALIGN must advise ELAMEX in writing,
        before the execution of this Agreement, of any prior lien or interest
        granted on such items. In addition, ALIGN warrants and hereby represents
        to ELAMEX that no other entity shall be granted any interest in such
        items without the prior written approval of ELAMEX.

8.9.    Payment shall be addressed to ELAMEX via wire transfer in The United
        Stares of America.

9.   Term

9.1.    The initial term ("Term") of this Agreement shall be for a period of one
        (1) year commencing on 6, 2000 ("Commencement Date"). ALIGN shall have
        the option to renew this Agreement in its entirety for successive
        periods of one (1) year each. Renewal of this Agreement for such
        successive one (1) year periods shall be automatic and irrevocable,
        unless ELAMEX or ALIGN request that the Agreement not be renewed and
        such request is received by the other party at least

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        one hundred and eighty (180) days prior to the end of the first one (1)
        year term or any successive term thereafter.

10.  Early Termination and Termination Options

10.1.   Upon termination or expiration of this Agreement, and provided that
        ALIGN has paid or tenders at the date of termination all sums due ELAMEX
        hereunder, the options described in Sections 10.1.1 and 10.1.2 maybe
        exercised by ALIGN.

10.1.1. ALIGN may request an orderly shutdown of the assembly operation. Return
        of materials, tools, parts, Equipment, and other related property of
        ALIGN by ELAMEX shall be completed at ALIGN's expense. Furthermore,
        ALIGN agrees to:

10.1.2. Pay all severance costs of the applicable ELAMEX personnel as specified
        in Section 10.3(a); or

10.2.   ALIGN may request that all Services and employee-related contracts and
        obligations be transferred from ELAMEX to ALIGN's Mexican affiliate (the
        "Affiliate") to be incorporated by ALIGN for such purpose as follows:

10.2.1. The ELAMEX employees that occupy the positions listed on the then
        current Manning Table shall be transferred to the Affiliate on ALIGN's
        request. The costs arising therefrom, including but not limited to legal
        expenses and employee severance for employees not transferred, if any,
        shall be borne by ALIGN; and

10.2.2.

10.3.   In the event ALIGN terminates this Agreement in violation hereof before
        the end of the Term, or breaches this Agreement, it shall pay liquidated
        damages consisting of (i) the average of the monthly administrative fee
        for each month until the end of the term of the Agreement or for six
        months, whichever is shorter, (ii) the legal severance costs as required
        by Mexican law, (iii) any labor and operating costs then owed to ELAMEX
        by ALIGN under Section 8. In the event

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        this Agreement is extended for one (1) or more term, ALIGN'S obligation
        to the payment of liquidated damages will be equal to the end of the
        then current term or for 90 days which ever is shorter.

11.  Warranties

11.1.   ELAMEX and ALIGN mutually represent, covenant and warrant as follows:

11.1.1. Neither party nor any officer, director, controlling shareholder, or
        employee of either party a prohibited by any agreement, contract, of
        other obligation from engaging in the services to be performed pursuant
        hereto;

11.1.2. Neither the execution of this Agreement nor compliance with the terms
        and conditions hereof shall constitute a breach of any statute,
        ordinance, law, or regulation of any governmental authority or of any
        instrument or document to which either party is or may be bound;

11.2.   Each party shall perform all of its mutual obligations created by the
        terms of this Agreement in compliance with all applicable U.S. and
        Mexican laws and regulations. A party shall not be considered in default
        or breach of this Agreement, however, if it fails to perform all of its
        obligations created by the terms of this Agreement in compliance with
        all applicable U.S. and Mexican laws and regulations, because of, in
        connection with, or pursuant to the other party's acts or failure to
        act.

11.3.   Each party shall indemnify, defend, and hold the other party harmless
        from and against any and all claims, lawsuits, costs, customs penalties,
        damages, expenses, and liabilities of whatsoever nature and kind
        (including, but not limited to, attorney's fees and legal assistant's
        fees, litigation and court costs, amounts paid in settlement, and
        amounts paid to discharge judgments), as incurred, directly or
        indirectly related to or arising from, the breach or untruthfulness of
        any of the representations and warranties of this Agreement or such
        party's failure to comply with the terms of this Agreement or U.S. and
        Mexican laws and regulations applicable, including any obligation
        derived from Mexican labor law, IMSS law,

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        INFONAVIT law, income tax law and State and Federal payroll tax laws and
        any other law or legal provision so long as the indemnified party is not
        in material fault with respect thereto.

12.  Relationship of the Parties

12.1.   Nothing contained in this Agreement shall be construed to imply a joint
        venture, partnership, or principal-agent relationship between the
        parties, and neither party, by virtue of this Agreement, shall have any
        right, power or authority to act or create any obligation, expressed or
        implied, on behalf of the other party. Neither shall this Agreement be
        construed to create a light, expressed or implied, on behalf of or for
        use of any parties, aside from ALIGN and ELAMEX, and ALIGN and ELAMEX
        shall not be obligated, separately or jointly, to any third parties by
        virtue of this Agreement.

13.  Insurance

13.1.   Insurance coverage of ALIGN's property that is in ELAMEX' possession
        will be by ELAMEX under a "Special Causes of Loss" form, subject to the
        terms, conditions and exclusions of ELAMEX' insurance policies. ELAMEX
        is to provide coverage up to an amount of $500,000 for the benefit of
        ALIGN and naming ALIGN as an additional insured. ALIGN will be
        responsible for the amount of any deductible. To be certain that the
        amount ELAMEX provides to the insurance carrier is adequate, it is
        incumbent upon ALIGN to notify ELAMEX immediately in writing of any need
        to increase or decrease insurance amounts on ALIGN replacement value of
        machinery, equipment and value of inventories in ELAMEX' possession.
        ELAMEX, through its insurer, will also provide a maximum of $2,000,000
        sub-limit on flood insurance per location. This limit is shared by
        ELAMEX and all of its customers and will be prorata based on ALIGN'S
        limits as a portion of the total limit of all ELAMEX' customers and
        ELAMEX. ELAMAX shall give ALIGN an opportunity to review and approve the
        policy and shall provide a certificate evidencing such insurance with a

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        provision that coverage may not be canceled without 30 days prior notice
        to ALIGN. This certificate will fulfill ELAMEX' obligation under this
        paragraph.

13.2.   The parties release each other, and their respective authorized
        representatives, from any claim for damage to any person or to the
        Facility and the fixtures, personal property, improvements and
        alterations in or to the Facility that are caused by or result from
        risks insured against and paid for under any insurance policies carried
        by the parties or in force at the time any such claim arose.

14.  Notices

14.1.   All notices required to be sent to either party to this Agreement shall
        be in writing and sent by FedEx, DHL, UPS or registered or certified
        mail, postage or delivery prepaid, return receipt requested, to the
        address of the other party hereto, as set forth below, or to such other
        addresses as may hereafter be designated in writing:

14.1.1. As to ALIGN.

        Company

        Address

        City, State, Zip

        Telephone:

        Fax:

        Attention: Mr.

14.1.2. As to ELAMEX:

        Elamex, S. A. de CV.
        220 North Kansas, Suite 566
        (closest US port of entry), TX 79901
        Attention: Mr. Hector Raynal, President and CEO
        Telephone: (915) 774-8236
        Fax: (915) 774-8377

14.1.3. Notice shall be effective five business days after receipt is
        confirmed.

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15.  Force Majeure

15.1.   Anything herein to the contrary notwithstanding, ELAMEX shall not be
        required to perform any term, condition, or covenant in this Agreement
        if such performance is delayed or prevented by Force Majeure ("Force
        Majeure") which, for purposes of this Agreement, shall mean the
        following: acts of God, strikes, lockouts, material or labor
        restrictions imposed by any governmental authorities, suspension of
        civil rights, floods, and any other causes not reasonably within the
        control of ELAMEX, which by the exercise of due diligence ELAMEX is
        unable, wholly or in part, to prevent or overcome and which prevent
        the performance by either party of the terms of this Agreement.

15.2.   If a Force Majeure continues for more than thirty (30) consecutive days,
        ALIGN or ELAMEX may terminate this Agreement after thirty (30)
        consecutive days of a Force Majeure by providing thirty (30) days
        written notice to the appropriate party of such termination, provided
        such notice is sent while performance of this Agreement is prevented
        by such Force Majeure, and in that event, ELAMEX will transfer ALIGNS
        property to ALIGN in (closest US port of entry), Texas, at ALIGNS
        expense provided all Mexican, customs requirements are satisfied.
        ALIGN's entire obligation to ELAMEX after such termination will be the
        payment of any unpaid amounts due to ELAMEX as stated in paragraph 8
        plus employee severance costs.

16.  Bailment

16.1.   Property delivered by ALIGN to ELAMEX under the terms of this Agreement
        is deemed to be bailed to ELAMEX for ALIGN's benefit. The initial
        property to be bailed to ELAMEX is described in Exhibit D attached. All
        Product and other items bailed to ELAMEX shall be described in a
        pedimento, separate from any goods owned by any other person, entity, or
        organization, including ELAMEX. It shall be ELAMEX' responsibility to
        ensure that the bailed property is insured, which cost shall be borne by
        ALIGN. ALIGN may, at its option, procure its own insurance.

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16.2.   The bailment is a free bailment.  ALIGN will provide equipment, raw
        materials and other items to ELAMEX, free of charges, subject to the
        terms of this Agreement.

16.3.   ALIGN agrees to deliver equipment, raw materials and other items to
        ELAMEX, and ELAMEX agrees to accept delivery of such, in accordance
        with the terms described herein.

16.4.   ELAMEX agrees:

16.4.1. to use the equipment, raw materials and other items exclusively to
        carry out activities required to manufacture the Product for the
        benefit of ALIGN;

16.4.2. to use such equipment, raw materials and other items in accordance with
        industry standards and the corresponding laws, regulations, norms,
        ordinances and rules in force in Mexico; and

16.4.3. that the equipment, raw materials and other items shall not be used
        outside the Facility, except with the prior written consent of ALIGN.
        ELAMEX may not use or permit the use of the equipment, raw materials and
        other items in any manner so as to cause ALIGN or the owner of such to
        lose deductions, credits or other benefits of ownership thereof.

16.5.   ELAMEX shall promptly notify ALIGN of knowledge of any damage to
        equipment, raw materials or other items.

16.6.   Upon delivery to ELAMEX, equipment will bear marks showing that ALIGN
        owns such.  ELAMEX shall ensure that equipment remains so marked
        throughout the term of this Agreement.

16.7.   ALIGN or its designated agent shall have the right, from time to time,
        to inspect equipment, raw materials, Product and ELAMEX records and
        books with respect to such at any reasonable time. Such inspections will
        be allowed during normal office hours and be requested three (3) days
        prior to the date of inspection.

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17.  Arbitration

17.1.   Commercial Nature. The parties hereto recognize this Agreement is of a
        commercial nature and will be construed in accordance with applicable
        commercial laws. All disputes, controversies or claims (Hereinafter
        singularly, "Controversy" and collectively, "Controversies") arising out
        of this Agreement shall be settled by binding arbitration pursuant to
        the following express procedure:

17.2.   Applicability. All Controversies arising in connection with this
        Agreement shall be settled by mutual consultation in good faith between
        the parties as promptly as possible, but in any event within five (5)
        calendar days from the date the other party was formally notified in
        writing of the Controversy. If the parties fail to reach an amicable
        settlement within such term, the Controversy shall be settled by binding
        arbitration using the procedural rules of the American Arbitration
        Association ("AAA") in effect upon the execution of this Agreement, with
        the following exceptions: i) at the request of either party, the
        arbitral tribunal may take any interim measures it deems necessary
        respecting the conduct of the business affairs of the parties, including
        measures to preserve the status quo in existence immediately prior to a
        certain date and measures for the conservation or protection of the
        assets of the parties; ii) while the parties shall be bound by the AAA
        procedural rules, the parties shall not be required to choose a AAA
        arbitrator, except in the case set out in section 17.6 below.

17.3.   Exclusive Method. The parties hereto agree that such arbitration shall
        be the sole and exclusive method of resolving any and all Controversies.
        Until completion of such: procedures, no party may take any action not
        contemplated herein to force a resolution of the Dispute by any
        judicial, other arbitral or similar process, except to the limited
        extent necessary to (i) avoid expiration of a claim that might
        eventually be permitted hereby or (ii) obtain interim relief, including
        injunctive relief, to preserve the status quo or prevent irreparable
        harm.

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17.4.   Request for Arbitration. A party may at any time serve its request for
        arbitration upon the other in accordance with the notice provisions of
        this Agreement. Such request for arbitration shall formally request
        arbitration and shall specify in detail the reasons therefore, the
        amount involved, if any, and the particular remedy sought.

17.5.   Response. The party that has not requested arbitration shall respond to
        the request for arbitration within ten (10) calendar days of receipt of
        such notice by delivering a written response in accordance with the
        notice provisions of this Agreement. The response shall describe
        counterclaims, if any, the amount involved, and the particular remedy
        sought. If a party farts to respond within the allotted time to the
        request for arbitration, the arbitrator selected pursuant to paragraph
        17.6 below shall resolve the Controversy within thirty (30) calendar
        days counted as of the deadline for such response.

17.6.   Appointment of Arbitrator. The parties agree to choose the person who
        shall act as arbitrator within five (5) working days following the date
        of delivery of the request for arbitration. The patties will not be
        required to choose a AAA arbitrator within this five-day period. If the
        parties do not reach an Agreement regarding the arbitrator within of
        five (5) working days, the arbitrator shall be appointed by the AAA
        pursuant to its Rules within a period of ten (10) working days from the
        date of delivery of the request for arbitration by the party requesting
        the arbitration, and for such purposes the parties waive their right to
        appoint an arbitrator and agree to accept the appointment made pursuant
        to the criteria of the AAA.

17.7.   Qualified Arbitrator. The arbitrator selected in accordance with
        paragraph 17.6 above shall be an individual not related to or employed
        at any time by either of the parties or any of their affiliates.

17.8.   Place of Arbitration.  All arbitration sessions hereunder shall beheld
        and conducted at a site in (closest LS port of entry), Texas chosen by
        the responding party.

                                    17 of 24
<PAGE>

17.9.   Arbitration Hearing; No Discovery. The arbitration hearing shall
        commence within thirty (30) calendar days of appointment of the
        arbitrator. The hearing shall in no event last longer than two (2)
        calendar days. There shall be no discovery or dispositive motions (such
        as motions for summary judgment or to dismiss or the like) except as may
        be permitted by the arbitrator, and any such discovery or dispositive
        notions permitted by the arbitrator shall not in any way extend the time
        limits contained herein. The arbitrator shall not be bound by any rules
        of civil procedure or evidence other than the applicable rules of the
        AAA, and may require the parties to submit some or all of their case by
        written brief such other manner as the arbitrator may determine. It is
        the intention of the parties to limit live testimony and cross
        examination to the absolute minimum necessary to ensure parties receive
        a fair hearing on significant and material issues.

17.10.  Remedies. The arbitrator shall not extend, modify or suspend any of the
        terms o Agreement, but shall have the authority to assess damages
        sustained by reason of breach of this Agreement and to make an award as
        he or she sees fit. In the event either party fails to appear at any
        properly noticed arbitration proceeding, an award ma entered against
        such party by default. The decision of the arbitrator shall be final
        binding on all parties.

17.11.  Language.  The arbitration shall be conducted in English.

17.12.  Arbitrator's fees. The arbitrator shall be compensated at no more than
        the star hourly rate charge by arbitrators appointed by the AAA. The
        prevailing party shall be entitled to recover from the non-prevailing
        party all costs and expenses of the arbitration, including the
        arbitrator's Fees and reasonable attorneys' fees.

17.13.  Applicable Law and jurisdiction. The applicable commercial laws of Texas
        govern this Agreement. The parties acknowledge that any competent
        courts, wherever located, shall have jurisdiction to enforce the
        arbitral awards) issued pursuant to arbitral procedure, and the parties
        expressly waive their right to the

                                    18 of 24
<PAGE>

        jurisdiction that by reason of their present or future domiciles or by
        any other reason under which they fall.

17.14.  Performance of the Parties' Obligations. The parties agree to continue
        performing respective obligations under this Agreement while the
        Controversy is being resolved.

17.15.  Confidentiality. All matters relating to any arbitration hereunder shall
        be designate confidential information, shall be maintained in strict
        confidence by the AAA arbitrator, and the parties, and shall be deemed
        to have been delivered in furtherance of Dispute settlement and shall be
        exempt from discovery and production, and shall not be admissible in
        evidence (whether as an admission or otherwise), in any arbitral or
        proceeding for the resolution of the Dispute or otherwise.

17.16.  Post Award Interest. The award of the arbitrators shall be in dollars
        and shall bear interest, until paid, at an annual rate equal to twice
        the prime rate as recorded in the Wall Street Journal on the of the
        award (or if such date is not a business day on the next business day).

18.  Environmental Indemnity

18.1.   ALIGN shall have no liability and ELAMEX shall indemnify, defend and
        hold harmless ALIGN and its agents and representatives against any and
        all claims, judgments, ages, encumbrances, liens, reasonable attorney's
        fees and reasonable consultant fees, as incurred to the extent they
        arise from violations of law, regulations or norms related to Hazardous
        Substances (as hereinafter defined) at or about the Facility caused or
        permitted by ELAMEX, its agents, employees, contractors or invitees.

18.2.   ELAMEX shall have no liability and ALIGN shall indemnify, defend and
        hold harmless ELAMEX and its agents and representatives against, any and
        all claims, judgments, damages, encumbrances, reasonable attorney's fees
        and reasonable consultant fees, as incurred, to the extent they arise
        from violations of law,

                                    19 of 24
<PAGE>

        regulations or norms related to Hazardous Substances (as hereinafter
        defined) at or about the Facility caused directly by the independent
        acts or omissions of ALIGN's representatives, its agents, employees,
        contractors or invitees.

18.3.   For the purposes hereof, the term "Hazardous Substance" shall mean (i)
        any substance, chemical or wastes that are listed or defined as
        hazardous, toxic or dangerous under Mexican Federal and State Law,
        including ecological norms and regulations, or the Comprehensive
        Environmental Response Compensation and Liability Act 142 U.S.C 9601 et
        seq., and (ii) radioactive materials, petroleum or hydrocarbons.

19.  Default

19.1.   A party may terminate this Agreement immediately upon written notice to
        the other, unless otherwise specified herein, upon the occurrence of any
        of the following events:

19.2.   The commission of a breach of any undertakings, obligations or covenants
        contained herein and the failure to cure the breach, within thirty
        (30) days after written notification thereof;

19.3.   If any petition in bankruptcy has been filed by or against a party, or
        any order shall be issued or any resolution passed for the winding up,
        liquidation or dissolution of a party, or if a receiver shall be
        appointed for a party or its property, or if any substantial portion of
        its goods or property shall be taken in execution, or if a party shall
        cease to be a going concern, or makes an assignment for the benefit of
        creditors; or

19.4.   Any assignment by a party hereto in violation of this Agreement of all
        or any portion of its rights or obligations under this Agreement to any
        person or entity.

20.  Miscellaneous

20.1.   The terms and provisions contained herein constitute the entire
        agreement between the parties and shall supersede all previous
        communications, oral or

                                    20 of 24
<PAGE>

        written, between the parties hereto concerning the subject matter of
        this Agreement. No agreement of understanding varying or extending the
        same shall be binding upon either party hereto unless in writing and
        signed by a duly authorized officer or representative thereof.

20.2.   Each individual executing this Agreement on behalf of a corporation
        represents and warrants that he is duly authorized to execute and
        deliver this Agreement on behalf of said corporation in accordance with
        a duly adopted resolution of the Board of Directors of said corporation,
        a copy of which shall be delivered within fourteen (14) days of the
        execution of this Agreement.

20.3.   All covenants and agreements of ELAMEX and ALIGN which, by their terms
        or by reasonable implication, are to be performed, in whole or in part,
        after the expiration or termination of this Agreement, shall survive
        such expiration or termination for any reason.

20.4.   If, for any reason, any provision(s) of this Agreement is/are determined
        to be invalid or unenforceable, such invalidity or unenforceability
        shall not affect the remaining provisions of this Agreement.

20.5.   All exhibits/schedules referenced in this Agreement may be modified,
        amended, or changed as approved in writing by the parties to this
        Agreement. Such written approval shall indicate the date said
        modification, amendment, or change is effective and be signed by all
        parties to this Agreement.

20.6.   This Agreement was prepared following arm's length negotiations between
        the parties and is to be deemed as prepared jointly by the parties
        hereto. In the event of any uncertainty or ambiguity existing in this
        Agreement, it shall not be interpreted against either party but
        according to the application of general rules of construction and
        interpretation of contracts.

20.7.   This Agreement tray be executed in identical counterparts, in which
        event, each of said counterparts shall be deemed an original. All such
        counterparts taken together shall constitute one and the same
        instrument.

                                    21 of 24
<PAGE>

20.8.   Time is of the essence of this Agreement. No failure by a party to take
        action on account of any default by the other party, whether in a single
        instance or repeatedly, shall constitute a waiver of any default or of
        the required performance. No expressed waiver by a party of any
        provision or performance hereunder or any default by the other party
        shall be construed as a waiver of any future provision, performance, or
        default.

20.9.   This Agreement shall be binding upon and shall inure to the benefit of
        the parties hereto and their respective successors and assigns. No
        obligation or requirement contained in this Agreement may be assigned to
        or assumed by another entity without the express written consent of the
        parties hereto, except that ELAMEX may assign performance of all or part
        of its duties to a subsidiary without affecting any obligation of ELAMEX
        imposed by this Agreement.

20.10.  The titles and headings contained in this Agreement are for convenience
        only and shall have no substantive effect. As used herein, the phrase,
        "this Agreement" or "the Agreement" shall be deemed to include all
        exhibits and schedules referenced herein. The English language version
        of this Agreement shall control over a Spanish version, if any, hereof.

In Witness whereof, the parties hereto have executed this Agreement as of
______________.

Elamex, S. A. de C.  V.                        Align Technologies, Inc.

By: Hector M. Raynal                           By: ____________________
Title: President and CEO                       Title: _________________
Date: _________________                        Date: __________________

          Witness:                                    Witness:

By: ____________________                    By: ___________________
Date: __________________                    Date: _________________

                                    22 of 24
<PAGE>

                            [ORGANIZATIONAL CHART]

                                    23 of 24
<PAGE>

                       [ALIGN TECHNOLOGY PAKISTAN CHART]

                                    24 of 24<PAGE>

                                                                    Exhibit 10.8

September 7, 1999

Mr. Zia Chishti
Align Technology, Inc.
442 Potrero Avenue
Sunnyvale, CA 94086

Re:  Joint Development Program

Dear Mr. Chishti::

Reference is made to earlier discussions and joint work between personnel of 3D
Systems, Inc. ("3D") with personnel of Align Technology, Inc. ("ALIGN") and the
December 14, 1998 and January 9, 1999 Confidentiality and Non-Disclosure
Agreements between these two organizations in which both corporations pledged to
safeguard and not disclose the Confidential Information of the other.

In those earlier discussions, the ALIGN personnel outlined ALIGN's extensive
experience with build styles to make dental alignment tools.  The 3D personnel
outlined 3D's research experience and marketing efforts regarding its SLA 7000
imaging system technology, including but not limited to its special
stereolithographic build styles.

It is now anticipated that joint laboratory testing and analysis of the testing
results will be conducted at both 3D's and ALIGN's facilities dining the next
twelve (12) months studying the efficacy of 3D's SLA 7000 imaging system with
respect to ALIGN's total build style and speed in making dental alignment tools.

Therefore, 3D and ALIGN wish to enter into a joint development program.  The
primary objective of this program will be to jointly develop special build
styles for use on the SLA 7000 imaging system that will produce dental alignment
tools.  Other objectives will be to share system technological information on
how to reduce "dead" time in the SLA 7000 imaging system, and to otherwise make
the building of such tools more efficient.

In consideration of the premises set forth above, 3D and ALIGN agree to the
following conditions for this joint development program.

1.   Term of Agreement
     -----------------

This agreement shall be in effect for a period of one (1) year from the date of
full execution of this Letter Agreement, after which period the results of the
program will be reviewed and a joint
<PAGE>

Align Technology, Inc.
Page 2 of 6

determination of additional work, if any, or further Agreements, if any, will be
made. 3D and ALIGN may before or at that time extend or renew this Agreement by
a written document on mutually acceptable terms.

2.   Work Agenda
     -----------

The agreed to planned project and milestone chart for this development work is
attached hereto as Appendix A.  Immediately upon full execution of this
Agreement, representatives from both 3D and ALIGN will periodically meet to
discuss a detailed work agenda in line with the planned project and milestone
chart.  Work will then proceed according to that mutually agreed upon agenda.

3.   Furnished Resources and Place of Work
     -------------------------------------

ALIGN and 3D agree to provide the necessary equipment at their respective
facilities in Sunnyvale, California and Valencia, California for the development
work.  ALIGN and 3D agree that they will independently supply sufficient
quantities of resin material for this development work.  It is agreed that the
work will be carried on at both ALIGN and 3D's facilities, as needed.

4.   Compensation
     ------------

Each party shall bear its own cost.  3D shall pay the substantial Non-Recurring
Engineering costs necessary to reduce dead time and optimize build styles.  In
consideration of this, and to assure consistent quality and performance, ALIGN
agrees to use only 3D supplied materials in its SLA imaging systems.

5.   Confidentiality of Information
     ------------------------------

     (a)  Information exchanged between ALIGN and 3D under this Agreement may
          include business or technical information which is confidential to the
          respective parties (hereinafter referred to as Confidential
          Information).  The parties agree to treat such Confidential
          Information received hereunder as follows:

          (1)   The party receiving Confidential Information will exercise the
                same degree of care to prevent disclosure of the Confidential
                Information for the period specified below as it takes to
                preserve and safeguard its own Confidential Information but, in
                any event, no less than a reasonable degree of care.
          (2)   The obligations of the receiving party, contained in Paragraph
                (1) above, shall not apply to any Confidential Information
                which:
                a)    is already known to the receiving party or is
                      independently developed by it;
<PAGE>

Align Technology, Inc.
Page 3 of 6

                b)    is publicly available or becomes publicly available
                      without a breach of agreement by the receiving party,

                c)    is rightfully received by the receiving party from a
                      third party;

                d)    is furnished by the disclosing party to a third party
                      without a similar restriction of the third party's rights;

                e)    is not either (i) first disclosed in writing and
                      identified thereon as confidential or proprietary, or (ii)
                      if first disclosed orally, identified as confidential or
                      proprietary at the time of oral disclosure, reduced to
                      writing and identified thereon as confidential or
                      proprietary by the disclosing party and the writing
                      delivered to the receiving party within thirty (30) days
                      after oral disclosure; or

                f)    is the subject of a subpoena or a demand for production of
                      documents in connection with any suit or arbitration
                      proceeding, any administrative procedure or before a
                      governmental or administrative agency.

          (3)   All information which is deemed to be Confidential Information
                hereunder and which is disclosed by either party hereunder
                during the term hereof, shall be safeguarded as required by
                Paragraph (1) above by the receiving party for a period of five
                (5) yews from the date of disclosure, unless earlier
                specifically released by the disclosing party in a duly executed
                writing or made available from examination of a product made
                publicly available by the disclosing party.

          (4)   Unless explicitly stated otherwise, in this Agreement, the
                parties agree that no party is under any obligation to disclose
                Confidential Information by virtue of this Agreement. The
                parties recognize that from time to time during the term of this
                Agreement one party may wish to disclose information of
                character which is considered by such party to be so highly
                proprietary that additional restrictions on use or disclosure
                must be agreed to by the receiving party prior to disclosure. In
                such event, the parties agree that such information shall not be
                subject to this Agreement, but that the parties shall attempt to
                negotiate a separate Agreement governing the disclosure of
                such information prior to its disclosure.

          (5)   In the event of a breach of any of the obligations stated in
                this Confidentiality Clause, the injured party may proceed
                against the other party in law or in equity for such damages or
                other relief as a court may deem appropriate, consequential and
                indirect damages excepted.
<PAGE>

Align Technology, Inc.
Page 4 of 6

6.   Ownership of Developed Know-How
     -------------------------------

All know-how resulting from this joint development effort will be jointly owned,
provided that jointly developed know-how related specifically to dental
alignment shall only be used by 3D and ALIGN themselves and not by or through
third parties.  ALIGN shall we such inventions directly internally or indirectly
by having 3D provide the required dental alignment tools for ALIGN.  3D owns all
know-how, inventions, and patents issuing thereon for 3D's work carried out
prior to the starting date of this joint effort.  ALIGN owns all know-how,
inventions, and patents issuing thereon for ALIGN'S work carried out prior to
the starting date of this joint effort.

7.   Patentable Inventions
     ---------------------

Any patentable invention, made under this agreement shall be owned by the party
making it, if a sole inventor or jointly with the other party if jointly made.
However, joint inventions related specifically to dental alignment shall only be
used by 3D and ALIGN themselves and not by or through third parties.  ALIGN
shall use such inventions directly internally or indirectly by having 3D provide
the required dental alignment tools for ALIGN.  The parties agree to cooperate
in executing any necessary patent documents for filing for patent protection on
such inventions.  Each party agrees to cooperate, at the other party's
reasonable request, in the preparation of patent applications and in executing
patent documents for obtaining patent protection on such inventions.  The cost
of preparing, filing, and prosecuting patent applications will be borne by the
party owning the patent rights.

8.   3D's Right to Market Jointly Developed Know-How and Patents
     -----------------------------------------------------------

With respect to any ALIGN sole invention or any ALIGN interest in any Joint
Invention made in connection with or which is a result of any exchange of
Confidential Information between ALIGN and 3D, ALIGN hereby grants to 3D a
permanent and royalty-free non-exclusive license to use the same in its own
operations and a permanent and royalty bearing right to grant sublicenses to
third parties to use the same at a reasonable royalty to be agreed upon by and
between ALIGN and 3D.

With respect to any 3D sole inventions or any 3D interest in any Joint Invention
made in connection with or as a result of any exchange of Confidential
Information between ALIGN and 3D, 3D hereby grants to ALIGN a non-exclusive,
royalty-free and permanent license to use the same in its own operations, with
no right to grant sublicenses to third parties.

9.   Independent Contractors
     -----------------------

Each party will perform its obligation as an independent contractor and will be
solely responsible for its own financial obligations.  This Agreement will not
create a joint venture, partnership, or
<PAGE>

Align Technology, Inc.
Page 5 of 6

principal and agent relationship between the parties. Neither party will have
the authority or will represent that it has the authority to assume or create
any obligation, express or implied, on behalf of the other, except as expressly
provided in this Agreement.

10.  Liability for Injury
     --------------------

Each party will indemnify and hold the other party harmless from all loss and
liability on account of claims of personal injury, death, and/or property damage
resulting from any negligent act or omission by the party, including that
party's agents, employees, or subcontractors in the course of performing this
Agreement.

11.  Rights or Obligations
     ---------------------

No rights or obligations other than those expressly recited herein are to be
implied from this Agreement.  Nothing herein shall in any way affect the present
or prospective rights of the parties under the patent and copyright laws of any
country, or be construed as granting any license under any present or future
patent or application therefor of any party, or preclude the marketing of any
product of a party, except as provided by patents and copyrights.

12.  Assignment and Binding Effect
     -----------------------------

This Agreement may not be assigned by either party without the prior written
consent of the other party, except to a successor of the total business of the
assigning party, which consent shall not be unreasonably withheld.  This
Agreement shall be binding upon the parties hereto, their successors, legal
representatives, and permitted assigns, and all parties that control, are
controlled by, or are under common control of a party hereto.

13.  Governing Law
     -------------

This Agreement will be interpreted in accordance with the laws of the State of
California.

14.  Termination
     -----------

Either party shall have the independent right to terminate this Agreement at any
time, prior to its normal expiration date, by giving the other party a thirty
(30) day written notice to that effect.  Paragraphs 5, 6, 7, 8, 10, 11, and 12
shall survive the termination or expiration of this Agreement.

15.  Entire Agreement
     ----------------

This is the entire Agreement between the parties relating to the subject matter
hereof, and supersedes and replaces any prior agreements or understandings,
written or oral, relating thereto.
<PAGE>

Align Technology, Inc.
Page 6 of 6

This Agreement shall not be amended or modified except in a writing duly
executed by officers or authorized representatives of the parties.

If ALIGN agrees to the foregoing, please sign and date both duplicate copies of
this Letter Agreement and then return one copy to 3D.  Upon 3D's receipt of the
completely signed copy, this Agreement shall become a binding Agreement between
3D and ALIGN.

                                 Yours truly,

                                 3D SYSTEMS, INC.

                                 By:____________________________

                                 Title:_________________________

                                 Date:__________________________

ACCEPTED AND AGREED TO:

ALIGN TECHNOLOGY, INC.

By:_____________________________

Title___________________________

Date:___________________________

RD.jg
Attachment - Appendix A
<PAGE>

                                  APPENDIX A

                    Planned Project and Milestone Chart for
                        Align Technology and 3D Systems
                  Joint Development of Optimized Build Style

8/30/99   Initial team meeting with Align Technology and 3D Systems in Valencia,
          California, to develop a solution approach (project plan) for
          optimizing the SLA 7000 system for Align's specific application
          requirements. The proposed plan places an SLA 7000 system (rental
          program) at Align's Sunnyvale facility. Align will have access to
          parameter freedom and specially developed build styles.

8/31/99   3D determines availability of personnel and equipment.

9/3/99    SL 5410 placed in SLA 500 system (3D, Valencia) to warm up in
          preparation for single hatch build run of 72 arcs. 72 arcs built on
          SLA 7000 system with 0.006" layer thickness and standard hatch style.
          Actual build time: 7:08.

9/7/99    Built 72 arcs with single hatch build style on SLA 500 system with SL
          5410 to gain experience with the single hatch style. Built 72 arcs
          with custom developed (first iteration) of a single hatch style on the
          SLA 7000 system.9/8/99 3D eliminates some fill vectors and builds 72
          arcs with single hatch style.

9/9/99    3D attempts to reduce "dead" time with software changes. Align makes
          payment of $26,000 for the first month rental fee for an SLA 7000
          system rental under the 3D SLA Rental Program.

9/10/99   Proposed ship date for SLA 7000 rental system.

9/17/99   Proposed delivery and installation of SLA 7000 rental system at Align.

9/22/99   Technology installation of SLA 7000 system at Align complete.

9/23/99-  Align continues work to optimize parameters on operating SLA 7000
10/25/99  system with at least weekly feedback to Scot Thompson at 3D during
          initial reporting period in preparation for a potential larger scale
          implementation.
<PAGE>

                               SOFTWARE LICENSE

<TABLE>
<CAPTION>
3D SYSTEMS INC.
------------------------------------------------------------------------------------------------------------------------------------
CUSTOMER ADDRESS                                                 INSTALLATION SITE ADDRESS
------------------------------------------------------------------------------------------------------------------------------------

ALIGN TECHNOLOGY, INC.                                           ALIGN TECHNOLOGY, INC.
442 Potrero Avenue                                               442 Potrero Avenue
Sunnyvale, CA 94086                                              Sunnyvale, CA 94086
Attn: Len Hedge
Phone: (408) 738-1500
Facsimile: (408) 738-7150
------------------------------------------------------------------------------------------------------------------------------------
SOFTWARE INFORMATION
------------------------------------------------------------------------------------------------------------------------------------
        ITEM              PRODUCT NO.                                     PRODUCT DESCRIPTION
------------------------------------------------------------------------------------------------------------------------------------
<S>                       <C>                <C>
         1                                   SLA 7000 Buildstation Software

         2                                   3D Lightyear Windows NT Part Preparation Software

------------------------------------------------------------------------------------------------------------------------------------
OFFER AND ACCEPTANCE
------------------------------------------------------------------------------------------------------------------------------------
                                                           PLEASE READ:
This document, when signed by Customer, is an acceptance by Customer to 3D's offer to license from 3D the Software listed above on
the terms and conditions attached hereto. Please read all of the terms and conditions carefully. If accepted by 3D, an authorized
officer will sign the Agreement in the space below and it will become a License Agreement.
------------------------------------------------------------------------------------------------------------------------------------
                        DATE PROPOSED                                           PROPOSAL VALID UNTIL
------------------------------------------------------------------------------------------------------------------------------------
OFFERED BY:                                                ACCEPTED BY:         3D SYSTEMS, INC.
                                                                                26081 Avenue Hall
                                                                                Valencia, California 91355
CUSTOMER NAME__________________________________                                 (805) 285-5600   FAX (805) 257-3205

BY:_________________________DATE_______________            BY__________________ DATE_______________________________

TITLE__________________________________________            TITLE___________________________________________________
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

                                                          Number WR-083099JS-001
                          SOFTWARE LICENSE AGREEMENT
                              TERMS & CONDITIONS

                                                                     PAGE 2 OF 2

1.   GENERAL PROVISION - 3D has developed proprietary computer programs and
     related information (Software) intended to increase the utilization and
     effectiveness of equipment manufactured by 3D.  If either party believes
     that other matters beyond those covered in this Agreement, that party will
     (a) write them on the front of this Agreement or (b) staple a copy or
     description of them to this Agreement and initial them before signing;
     otherwise, they are not included as part of this Agreement for the license
     for the use of the Software.  Provided Customer has signed this Agreement
     (or any Amendment to it), even if Customer's signature was after the
     proposal expiration date, this Agreement will become a binding contract
     when and if it is executed by an appropriate official of 3D in Valencia,
     California.  If part of this contract is prohibited, the remainder of it
     will still be valid.

2.   WARRANTY - 3D warrants that at the time of installation, the Software will
     perform in accordance with the specification as described in 3D's reference
     manuals when used on equipment manufactured by 3D.  3D agrees to promptly
     correct any faults, inaccuracies, inconsistencies or omissions in the
     Software, notified to 3D during the warranty period.  The warranty period
     is one (1) year and shall start sixty (60) days after delivery to the
     carrier (F.O.B. 3D's Plant) or upon installation, whichever is sooner.
     THIS WARRANTY IS INSTEAD OF ANY OTHER WARRANTIES, SUCH AS MERCHANTABILITY
     OR FITNESS FOR INTENDED OR PARTICULAR PURPOSES.

3.   INSTALLATION - 3D agrees to install the Software on 3D's manufactured
     equipment at the Customer location designated.  3D will be responsible for
     insuring that all 3D sample programs are functioning properly.  It is the
     Customer's responsibility to acquire or create the required Software
     libraries for inclusion with the 3D Software, all CAD interfaces and for
     the total systems operation.  Installation and maintenance will be
     performed by 3D between 8:00 am and 5:00 pm, Local Time, on normal working
     days.  3D and Customer will cooperate to satisfy any Customer security
     requirements and still allow full and free access to the Equipment.

4.   PAYMENT - Payment and the amount of the one-time license and installation
     fees are included in that certain Proposal and Agreement for the purchase
     of 3D equipment referred to on the first page of this Agreement.

5.   PATENTS - If anyone claims the Software infringes their U.S. Patent,
     copyright, trade secret or other proprietary right, 3D will indemnify and
     hold Customer harmless from any damages, judgments or settlements
     (including costs and reasonable attorneys' fees) resulting from the claim
     if Customer promptly notifies 3D in writing of the claim and permits 3D to
     elect to take over the defense of the action.  If 3D takes over the
     defense, it may select the counsel and have the sole right to defend or
     settle the matter.  3D may substitute comparable non-infringing Software,
     or modify the Software (which still must meet the specification) to make it
     non-infringing, or obtain a right for the Customer to continue using the
     Software (all at 3D's expense).  If the software is not as warranted, 3D's
     liability for damages resulting from this Agreement or any breach thereof,
     including liability for patent or copyright infringements or warrant of
     title, regardless of the form of action, shall not exceed the charges paid
     to 3D by Customer under this Agreement.  Notwithstanding the foregoing, 3D
     shall not be obligated to defend or be liable for costs and damages for
     patent or copyright infringement if the infringement arises out of a claim
     based upon any portion of the UNIX Software, provided, however, that this
     exclusion does not apply to any additions or enhancements to the UNIX
     Software made by 3D.

     In the event the Software is used on equipment other than equipment
     manufactured by 3D, this Agreement shall forthwith terminate, the warranty
     shall be void, 3D shall have no liability to the Customer as a result
<PAGE>

     of the Customer's use or non-use of the Software, and 3D shall have no
     obligation to install or repair the Software.

6.   TITLE - Title to all Software, algorithms, derivations, modifications, and
     any and all reproductions thereof, remains in 3D and the Customer agrees to
     return all such material to 3D within thirty (30) days after the
     termination or expiration of this Agreement.  None of the Software,
     algorithms, derivations, modifications or reproductions may be sublet,
     sublicensed, assigned, or any other interest transferred by the Customer
     without prior written consent of an officer of 3D.  A nominal Re-Licensing
     fee may be charged upon approved authorization of transfer.  Any attempt by
     Customer to sublet, sublicense, assign or transfer any of the rights,
     duties or obligations under this Agreement shall terminate this Agreement.

7.   MODIFICATIONS - 3D may change the Software specifications at any time
     without notice as long as the modification(s) will not materially affect
     the performance of the Software.

8.   USE - Customer agrees to limit the use of the Software and its derivations
     to use with the 3D equipment on which the Software is initially installed.
     Customer agrees that it shall not reverse compile or disassemble any
     portion of the Software.  Customer will refrain from disclosing or
     permitting the transfer of this Software to any third parties without 3D's
     prior written consent.  Customer agrees that all of these restrictions on
     the use of the Software are reasonable.

9.   TERM - The term of the Software License shall begin on the date that this
     Agreement is executed by both parties and shall continue until canceled as
     provided herein.

     This Agreement and any licenses granted hereunder are subject to
     cancellation for cause by either party or for failure to comply with any
     terms and conditions herein; provided however, that the party in breach
     shall have sixty (60) days to cure such breach following written
     notification.  This Agreement and any licenses granted hereunder are
     further subject to cancellation if the other party files or has filed
     against it any bankruptcy proceedings or makes an assignment for the
     benefit of creditors, or by Customer at any time upon sixty (60) days
     written notice to 3D.

10.  OTHER

     A.   This Agreement will be interpreted under California law and both 3D
          and Customer will be subject to jurisdiction of state and federal
          courts in Los Angeles County, California.
     B.   Both 3D and Customer will comply with all laws applicable to this
          Agreement.
     C.   All notices given under this Agreement will be effective when received
          in writing.  Notices to the Customer and 3D will be sent to the
          address on the front page of this Agreement.  Either party can give
          notice of an address change.

11.  COMPLETE AGREEMENT - Customer acknowledges that it has read this Agreement,
     understands it, and agrees to be bound by its terms and conditions.
     Further, Customer agrees that it is the complete and exclusive statement of
     this Agreement between the parties, which supersedes all proposals, printed
     provisions on subordinate Customer documents including purchase orders,
     oral or written Agreements, and all other communications between the
     parties relating to the subject matter of this Agreement.
<PAGE>

                               RENTAL AGREEMENT
                                                                     PAGE 1 OF 4

3D CAPITAL CORPORATION

<TABLE>
<CAPTION>
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          CUSTOMER ADDRESS                                                                INSTALLATION SITE ADDRESS
------------------------------------------------------------------------------------------------------------------------------------
ALIGN TECHNOLOGY, INC.
442 Potrero Avenue                                                               ALIGN TECHNOLOGY, INC.
Sunnyvale, CA 94086                                                              475 Potrero Avenue
Attn: Len Hedge                                                                  Sunnyvale, CA  94086
Phone:  (408) 738-1500
Facsimile:  (408) 738-7150

------------------------------------------------------------------------------------------------------------------------------------
CONTACT NAME/TITLE                          TELEPHONE               CONTACT NAME/TITLE                   TELEPHONE
                                                                                                         (     )
------------------------------------------------------------------------------------------------------------------------------------
EQUIPMENT
------------------------------------------------------------------------------------------------------------------------------------
ITEM      MODEL                                 DESCRIPTION                                     LASER USAGE          BASE RENT
                                                                                                     FEE
------------------------------------------------------------------------------------------------------------------------------------
<S>     <C>              <C>                                                                    <C>                  <C>
 1                       SLA 7000 Rental Program Consisting of:                                   UNLIMITED           $26,000

        SLA-7000         Stereolithography Apparatus
                         Buildstation software
                         3D Lightyear Windows NT part preparation software (including automatic
                         support generation and QuickCast investment casting functionality)
                         two platforms
                         Training Credit (One Student)

        PCA-500          Post Cutting Apparatus

        SL-7510          Polymer Cilbatool SL 7510 (Initial VAT Fill) Use of Cibatool resins
                         sold by 3D Systems is a requirement of this rental agreement.

                         (Service and Laser Refurbs included during term of Lease)

                         Freight, Freight Insurance, Installation, Packaging and Handling
                         included.

                         CUSTOMER SHALL HAVE THE OPTION TO PURCHASE ADDITIONAL SL 7510 RESIN
                         WITH A TWELVE PERCENT (12%) DISCOUNT PROVIDED CUSTOMER ISSUES A
                         BLANKET PURCHASE ORDER TO 3D SYSTEMS COMMITTING TO $125,000 IN
                         RESIN SALES OVER A TWELVE CONSECUTIVE MONTH PERIOD.
------------------------------------------------------------------------------------------------------------------------------------
                                                                                      TOTAL AMOUNT
                                                                                      EXCLUSIVE OF TAXES
------------------------------------------------------------------------------------------------------------------------------------
NON-REFUNDABLE               PREPAYMENT DUE:              TAXABLE           TAX EXEMPT NO.        PREPARED BY: NAME AND PHONE
   DEPOSIT                                                [_] YES                                 Roger Peterson (861) 285-5800
   Waived                       $28,000                   [_] NO                                  Extension 2382

------------------------------------------------------------------------------------------------------------------------------------

OFFER AND ACCEPTANCE
------------------------------------------------------------------------------------------------------------------------------------
PLEASE READ: THIS RENTAL AGREEMENT IS SUBJECT TO THE TERMS AND CONDITIONS ATTACHED HERETO. NO OTHER TERMS AND CONDITIONS WILL APPLY.
PLEASE READ ALL TERMS AND CONDITIONS CAREFULLY. BY SIGNING BELOW CUSTOMER REPRESENTS THAT CUSTOMER HAS READ THE TERMS AND
CONDITIONS ATTACHED HERETO AND HAS ENTERED INTO THE RENTAL AGREEMENT PURSUANT TO SUCH TERMS AND CONDITIONS
------------------------------------------------------------------------------------------------------------------------------------
ACCEPTED BY:                                                              OFFERED/ACCEPTED BY:

__________________________________                                        3D Capital Corporation
 (TYPE OR PRINT CUSTOMER NAME)                                            26081 Avenue Hall
                                                                          Valencia, California 91355
By:______________________DATE_____                                        (881) 285-5600   FAX (881) 257-3205

                                                                          Roger Peterson, Director Credit and Leasing
__________________________________                                        -------------------------------------------
 (TYPE OR PRINT NAME AND TITLE)
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

                               RENTAL AGREEMENT
                             TERMS AND CONDITIONS

On the terms and subject to the conditions of this Agreement, 3D Capital
Corporation, it's successors, or assigns (collectively "3D"), hereby rents to
Customer, and Customer hereby hires from 3D equipment specifically identified on
the first page of this Agreement (the "Equipment").

1.   TERM OF THE AGREEMENT

     This Agreement shall be valid and binding from the date on which it has
been accepted by 3D (the "Effective Date"), and shall remain in effect until all
obligations of either party hereto have been fully performed or satisfied.  The
("Acceptance Date") is the date that Customer accepts the Equipment as stated in
the "Installation Acceptance" certificate.  The "Rental Term" shall commence on
the first day of the month following the month in which the Acceptance Date
occurs (the "Commencement Date") and shall continue on a month-to-month basis
thereafter.

     Either party may terminate the Rental Term at any time upon providing
written notice to the other, specifying the date of such termination, however,
in no event shall said notice be less than 30 days prior to the date of
termination.

2.   DELIVERY AND INSTALLATION

     3D shall deliver and install the Equipment at the Installation Site set
forth on the first page of this Agreement not later than ninety (90) days after
the Effective Date.  Customer shall prepare the Installation Site, at its own
expense, in accordance with 3D's site specifications no later than thirty (30)
days prior to the scheduled delivery date.  Customer shall assume responsibility
for compliance with all laws and shall obtain, at its own expense, any permits
required for installation and use.

     Upon expiration or termination of the Rental Term, Customer shall
relinquish possession of the Equipment to 3D personnel for preparation and
subsequent shipment to 3D.  Any damage or excessive wear found by 3D personnel
shall be paid by Customer at 3D's then current replacement and or repair costs,
including labor.  All packing and freight charges shall be at 3D's expense.

3.   MONTHLY CHARGES

     Upon the Effective Date Customer agrees to pay to 3D the "Deposit" and the
first month's "Base Rent" as specified on the face of this Agreement.  Late
charges of five percent (5%) per month shall be applied to any invoice not paid
within ten (10) days.

     "Interim Rent" shall be due and payable on the Commencement Date in an
amount equal to 1/30th of the Base Rent times the number of days elapsed from
and including the Acceptance Date to and excluding the Commencement Date.

     After the first month, and during the Rental Term, Customer agrees to pay
to 3D the Base Rent as set forth on the face of this Agreement.  The Base Rent
will be invoiced at the beginning of each monthly period of the Rental Term, and
payment is due upon receipt of the invoice.

     Monthly laser usage which exceeds the "Laser Hours" specified on the face
of the Agreement will be subject to additional fees.  Such additional fees, if
any, will be calculated by multiplying the number of laser hours in excess of
the Laser Hours specified on the face of the Agreement times the "Laser Usage
Fee" specified on the face of the Agreement, and will be added to the succeeding
months invoice.  Said additional fees, if any, are dependent upon accurate laser
meter readings.  Customer must take and forward to 3D an accurate and timely
meter reading on the last day of each monthly period.

     Any deductions of laser hours for down time must be approved by 3D Field
Support Personnel and supported by Field Service Reports.  Upon prior notice, 3D
shall have reasonable access to the Equipment to monitor the meter readings.

     Customer shall pay for the usage and replenishment of Polymers at their
then stated market prices.

4.   TAXES

     Customer shall pay all applicable federal, state and local sales, use,
property or other taxes arising on charges hereunder or from the use of the
<PAGE>

Equipment. 3D shall be responsible for taxes based on its income generated from
this Agreement.

5.   OWNERSHIP

     The Equipment is and shall remain 3D's property and may be removed from
Customer's premises by 3D or its duly authorized agents at any time after
termination or expiration of the Rental Term.  This Agreement constitutes a
Rental o bailment of the Equipment and shall not in any way be deemed a sale or
the creation of a security interest.  Customer shall not have or at any time
acquire, any right, title or interest in or to the Equipment, except the right
to possession and use as provided for in this Agreement.  All installations,
replacements, or substitutions of parts or accessories with respect to the
Equipment shall constitute accession and shall become part of the Equipment and
shall be similarly owned by 3D.  If deemed necessary by 3D, 3D may execute a
UCC-1 Financing Statement (to be filed by 3D in the office of the appropriate
Secretary of State) as an acknowledgement that the Equipment in the custody of
Customer is owned by 3D.  Customer shall not move the Equipment from the
installation site without the expressed written permission of 3D.

6.   MAINTENANCE

     3D shall service the Equipment as required.  Customer shall have access to
3D's toll free customer support line, from 6:00 a.m. to 6:00 p.m. (Mountain
Time), in order to report any problems Customer may encounter in the operation
of the Equipment.  Customer agrees to give 3D access to the Equipment when
necessary for maintenance.  Maintenance occasioned by the negligence of
Customer, or by the use of attachments not provided and installed by 3D, or by
any abnormal use, or by movement of the Equipment to another location is not
covered by the Maintenance Agreement and Customer agrees to pay for such
services at 3D's then current rates.

7.   ALTERATIONS AND ATTACHMENTS

     No alterations or attachments to the Equipment shall be made without 3D's
prior written consent.  If Customer makes any alterations or additions to the
Equipment, Customer shall remove, at its own expense, such alterations or
attachments and restore the Equipment to its previous condition, upon receipt of
notice from 3D.

8.   RISK OF LOSS AND INSURANCE

     Customer agrees that upon the delivery of the Equipment to the Installation
Site and continuing until the Equipment is returned to 3D, Customer is
responsible for any and all loss or damage thereto, regardless of the cause
thereof.  If any item of the Equipment is damaged, destroyed or lost, Customer
shall be liable for the cost of repairing that item by 3D, or if 3D determines,
in its sole discretion, that repair cannot be made or is not practical, Customer
shall be liable for the replacement cost of the item of Equipment, less any
insurance proceeds received by 3D.  3D is not obligated to replace damaged,
destroyed or lost Equipment and upon such an occurrence, 3D has the right to
terminate the Rental Term.

     Customer shall assume the risk of and hold 3D, its directors, officers,
employees, agents and assignees harmless from and against any and all loss,
liability, claim, cost, damage or expense of any kind or nature caused directly
or indirectly by the use, performance, deficiency, defect in or inadequacy of
(i) any item of the Equipment, or (ii) the products, parts and/or services
created by or arising from the use of the Equipment.

     Customer shall maintain at its own expense comprehensive general liability
insurance and broad form contractual liability insurance, issued by companies
satisfactory to 3D.  Such insurance shall be for primary coverage and shall have
limits of no less the $500,000 for each person, $1,000,000 for each occurrence
and $500,000 for property damage per each occurrence.  The property damage
coverage must cover the Equipment of 3D held in the custody, care and control of
the Customer and such policy must designate 3D as a named insured thereunder.
Customer shall submit to 3D, no later than 15 days prior to the date the
Equipment is to be delivered to Customer, an insurance certificate evidencing
compliance with the required coverage.

     Customer shall notify 3D, within two days of the occurrence thereof, of any
accident, incident, damage, destruction, loss or other similar occurrence
concerning the Equipment.

9.   INDEMNIFICATION

     Customer agrees to indemnify, defend and hold harmless 3D, its directors,
officers, employees, agents and assignees from any loss, damage, claim,
liability and expense (including reasonable attorneys' fees and other expenses
of litigation) arising from or related to acts of commission or omission by
Customer under this Agreement.  This indemnity
<PAGE>

provision shall survive the termination of the Rental Term of this Agreement.

     3D agrees to defend Customer in any suit brought against Customer alleging
that the Equipment rented hereunder, uncombined with non-3D equipment, directly
infringes upon a United States patent owned by others, provided 3D is promptly
notified, given the assistance required and permitted to direct the defense.
Further, 3D shall pay any final judgment, based on such infringement, rendered
in such suit by a court of last resort, but shall not be responsible for
settlements or costs incurred without its consent.  If Customer's use of such
Equipment is enjoined, or if 3D desires to minimize its liability hereunder, 3D
may at its option either:  (i) substitute other equally suitable equipment; (ii)
modify the Equipment so that it no longer infringes; (iii) obtain for Customer
the right to continue use; or (iv) take back the equipment, releasing Customer
from the obligation of paying rentals not yet due.  The foregoing states the
entire liability of 3D for patent infringement.  No indemnity shall apply to
equipment made or modified to Customer's own specifications or design, nor for
any infringement caused solely by the combination of the Equipment with any
other apparatus by Customer.

10.  ASSIGNMENT

     Customer shall not assign, transfer or pledge all or any part of this
Agreement nor sell, rent or lend all or any item of the Equipment or permit it
to be used by anyone other than Customer and any effort by Customer to do so
shall be void and without effect.  Without notifying Customer, 3D may assign
this Agreement or any rights, title, interests or obligations thereunder at any
time.  If 3D assigns this Agreement, 3D's assignee shall have all the rights,
powers, privileges and remedies of 3D set forth in this Agreement.

11.  NON-DISCLOSURE

     Customer shall not disclose any of 3D's confidential information to third
persons or use such information for Customer's own benefit or the benefit of
others or use such information in any way that is adverse to 3D's interest.
Confidential information shall include any of 3D's developments, inventions,
business knowledge, know-how, discoveries, production methods and any and all
other confidential or proprietary information which may be disclosed to Customer
in connection with the installation, maintenance and use of the Equipment.

12.  SOFTWARE LICENSE
     Concurrent with executing this Agreement, Customer shall enter into a
Software License Agreement with 3D in the form attached hereto.

13.  DELAY

     3D shall not be liable for delays in manufacture, delivery or maintenance
due to causes beyond its control, including without limitation, acts of God,
strikes and difficulties in obtaining materials or labor.  In the event of such
delay, 3D's obligation to deliver the Equipment shall be extended for a
reasonable period or, if measurable, a period equal to the time lost by such
delay.

14.  DEFAULT

     A default under this Agreement shall be deemed to have occurred if Customer
has breached or failed to comply with a provision of this Agreement and such
breach or noncompliance continues in effect for 5 days.  Customer shall also be
deemed in "default" under this Agreement:  (i) upon the commencement by or
against Customer of any proceeding in Bankruptcy or similar law; (ii) upon the
appointment of a receiver for Customer; (iii) if Customer is adjusted insolvent;
or (iv) if any substantial part of Customer's property is or becomes subject to
seizure, levy, assignment or sale for or by any creditor or governmental agency
without being released or satisfied within 10 days thereafter.  Upon default by
Customer, 3D may in addition to its other rights and remedies at law or equity,
terminate this Agreement, sue Customer for and recover all charges and other
payments under this Agreement then accrued and unpaid and/or take possession of
any or all the Equipment and Software provided under or in conjunction with this
Agreement, without demand or notice, wherever the same may be located, without
any court order or other process of law.

15.  GENERAL PROVISIONS

     The remedies of 3D set forth in this Agreement shall be cumulative and in
addition to remedies existing in equity or law.  If any provision of this
Agreement is held to be invalid or unenforceable, the remainder of this
Agreement shall remain valid and in full force and effect.  This Agreement may
be executed in two or more counterparts, each of which shall be deemed an
original, but all of which together shall constitute one and the same
instrument.  Attorneys' fees incurred by either party in enforcing the terms and
provisions of
<PAGE>

this Agreement shall be borne by the losing party in such a proceeding. In no
event shall 3D be liable for any consequential or incidental damages, including,
but not limited to, loss of profits, arising under this Agreement. All notices
required to be given under this Agreement shall be made in writing and sent by
registered or certified mail or other means agreed upon by the parties, to the
addresses listed herein. Any amendments, changes or modifications of this
Agreement shall not be valid unless made in writing and signed by both parties.
THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF
THE STATE OF CALIFORNIA APPLICABLE TO CONTRACTS MADE IN, AND TO BE PERFORMED
WITHIN, SAID STATE. 3D AND CUSTOMER IRREVOCABLY WAIVE ANY OBJECTION TO ANY
ACTION PERTAINING TO THIS AGREEMENT BEING BROUGHT IN FEDERAL OR STATE COURTS IN
LOS ANGELES COUNTY, CALIFORNIA AND ANY CLAIM THAT SUCH ACTION WAS BROUGHT IN AN
INCONVENIENT FORUM.

16.  WARRANTY

     EXCEPT AS OTHERWISE EXPRESSLY PROVIDED HEREIN, 3D MAKES NO WARRANTIES,
EITHER EXPRESS OR IMPLIED, AND SHALL NOT, BY VIRTUE OF HAVING RENTED THE
EQUIPMENT COVERED BY THIS AGREEMENT, BE DEEMED TO HAVE MADE ANY REPRESENTATION
OR WARRANTY AS TO THE MERCHANTABILITY, DESIGN, FITNESS FOR ANY PARTICULAR
PURPOSE, OR CONDITION OF THE EQUIPMENT, OR THE QUALITY OF THE MATERIAL OR
WORKMANSHIP THEREIN.

17.  COMPLETE AGREEMENT

     This Agreement constitutes the entire agreement and understanding between
the parties hereto and supersedes all prior agreements, understandings and
communications relating to the subject matter of this Agreement.

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