Document:

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                                                                   EXHIBIT 10.30

                   STOCK PURCHASE AND STOCKHOLDERS' AGREEMENT

                                   (CTI INC.)

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

         This STOCK PURCHASE AND STOCKHOLDERS' AGREEMENT (this "Agreement") is
made and entered into as of the 7th day of January, 1988, by and among CTI
GROUP, INC., a Tennessee corporation with its principal office in Knoxville,
Tennessee (hereinafter referred to as "Group"), CTI, INC., a Tennessee
corporation with its principal office in Knoxville, Tennessee (hereinafter
referred to as "CTI"), DR. TERRY D. DOUGLASS, DR. RONALD NUTT, MICHAEL C.
CRABTREE and J. KELLY MILAM (hereinafter collectively referred to as
"Management" and individually as "Management Person"), and SIEMENS GAMMASONICS,
INC, a Delaware corporation with its principal office in Des Plaines, Illinois
(hereinafter referred to as "Siemens").

                                   WITNESSETH:
                                   ----------

         WHEREAS, Group, Siemens and Management have entered into a Stock
Purchase, Reorganization and Joint Venture Agreement dated December 10, 1987
(the "Reorganization Agreement"), under the terms of which Group is to acquire
certain CTI Common Stock (as hereinafter defined) in exchange for all of the
Cyclotron Common Stock (as hereinafter defined) (which Cyclotron Common stock is
presently owned by Group), and Group is then to distribute its CTI Common Stock
to its stockholders, including Siemens, resulting in Siemens owning certain
shares of CTI Common Stock; and

         WHEREAS, the parties hereto wish to confirm the terms under which such
shares of CTI Common Stock will be held by Siemens.

         NOW, THEREFORE, in consideration of the premises and the mutual terms,
covenants and conditions set forth herein, the parties agree as follows:

1.       CERTAIN DEFINITIONS. The following terms whenever used in this
         Agreement, shall have the meanings ascribed below. Other terms defined
         in the body of this Agreement shall have the meanings assigned therein.

         1.1      "Affiliate" shall. mean, with respect to a specified person, a
                  Person that directly, or indirectly, through one or more
                  intermediaries, controls, is controlled by, or is under common
                  control with, the specified Person, but shall not include any
                  Person less than fifty percent (50%) of the ordinary voting
                  power of which is not directly or indirectly held by the
                  specified Person and its affiliates unless such specified
                  Person and its affiliates control a majority of the board of
                  directors or other governing body thereof.
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         1.2      "Beneficial Ownership" or any derivative or variant thereof
                  shall have the meaning ascribed to it in Rule 13d-3
                  promulgated under the Exchange Act.

         1.3      "CTI Common Stock" shall mean the shares of voting common
                  stock of CTI, Inc., a Tennessee corporation, par value $.01
                  per share. Where appropriate, all references to CTI Common
                  Stock shall be deemed to include all subscription rights,
                  options or warrants to purchase CTI Common Stock, all
                  securities convertible into, or exchangeable for, such CTI
                  Common Stock and all securities entitled to vote in the same
                  manner and under the same circumstances as such CTI Common
                  Stock.

         1.4      "Cyclotron Common Stock" shall mean the shares of no par value
                  voting common stock of CTI Cyclotron Systems, Inc., a
                  California corporation. Where appropriate, all references to
                  Cyclotron Common Stock shall be deemed to include all
                  subscription rights, options or warrants to purchase Cyclotron
                  Common Stock, all securities convertible into, or exchangeable
                  for, such Cyclotron Common Stock and all securities entitled
                  to vote in the same manner and under the same circumstances as
                  such Cyclotron Common Stock.

         1.5      "Exchange Act" shall mean the Securities Exchange Act of 1934,
                  as amended.

         1.6      "Non-Siemens Group Shareholders" shall mean all the
                  shareholders of Group prior to the Closing other than Siemens
                  Capital Corporation.

         1.7      "Person" shall mean an individual, a corporation, a
                  partnership, an association, a joint company, a joint venture,
                  an unincorporated organization, a trust or other entity,
                  including, without limitation, any employee pension, profit
                  sharing and other benefit plans and trusts.

         1.8      "Phelps Agreement" shall mean the License Agreement between
                  Dr. Michael E. Phelps and CPS dated January 1, 1985, regarding
                  know-how (as defined therein) for the production of emission
                  computerized axial tomograph systems. The rights of Phelps
                  under the said License Agreement were assigned by Phelps to
                  Group pursuant to that certain stock Purchase and Technology
                  Transfer Agreement between them dated April 7, 1987.

         1.9      "SEC" shall mean the Securities and Exchange Commission.

         1.10     "Securities Act" shall mean the Securities Act of 1933, as
                  amended.

2.       SALE AND PURCHASE OF CTI COMMON STOCK. On the terms and subject to the
         conditions of this Agreement, and in reliance upon the representations,
         warranties, covenants and agreements in this Agreement and the
         Reorganization Agreement, CTI hereby agrees to sell to Group, and Group
         hereby agrees to

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         purchase from CTI, two hundred eighty thousand two hundred eighteen
         (280,218) shares of CTI Common Stock ("Group's CTI Shares"), comprising
         upon the Closing seven and 71/100 percent (7.71%) of the issued, and
         outstanding CTI Common Stock. The consideration for the purchase and
         sale of Group's CTI Shares shall be all of the Cyclotron Common Stock
         and all of Group's right, title and interest in the Phelps Agreement,
         as amended. The closing of such purchase and sale (the "Closing") shall
         take place simultaneously with the execution of this Agreement.

3.       DISTRIBUTION OF GROUP'S CTI SHARES. Simultaneously with the Closing,
         Group shall distribute Group's CTI Shares to its stockholders (CTI and
         Siemens) pro rata, as follows:

                   To CTI                            140,389 shares
                   To Siemens                        139,829 shares

         Thereafter, the CTI Common Stock received by CTI in the distribution of
         Group's CTI Shares shall be cancelled, and the issued and outstanding
         CTI Common Stock shall be hold as follows:

              Shareholder                       Percentage of Outstanding Shares
              -----------                       --------------------------------

           Non-Siemens Group Shareholders                     96%
           Siemens                                             4%

4.       REPRESENTATIONS AND WARRANTIES OF CTI. CTI hereby affirms and makes to
         Siemens the representations and warranties set forth in Section 5 of
         the Reorganization Agreement.

5.       REPRESENTATIONS AND WARRANTIES OF SIEMENS. Siemens represents and
         warrants to CTI as follows:

         5.1      Organization and Good Standing. Siemens is a corporation duly
                  organized, validly existing and in good standing under the
                  laws of the State of Delaware, and has full corporate power
                  and authority to carry on its business as it is now being
                  conducted and to own the properties and assets it now owns.

         5.2      Corporate Authority. The Board of Directors of Siemens has
                  duly authorized the execution, delivery and performance of
                  this Agreement. No other corporate proceedings on the part of
                  Siemens will be necessary to authorize this Agreement and the
                  transactions contemplated hereunder. Neither the execution,
                  the performance of this Agreement, nor compliance with or
                  fulfillment of the terms and provisions of this Agreement does
                  or will (a) violate or conflict with, or result in, any breach
                  of any of the terms, conditions or provisions of, or
                  constitute a default (or an event which with notice or lapse
                  of time, or both, would become a default) under

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                  the Certificate of Incorporation or Bylaws of Siemens or any
                  agreement, indenture, lease, mortgage or other instrument to
                  which it is a party or by which it is bound, (b) require any
                  affirmative approval, consent, authorization or other order or
                  action of any court, governmental authority or regulatory body
                  or of any creditor of Siemens, (c) result in any violation of
                  any provision of any law, rule, regulation or any court order,
                  judgment, writ, injunction, decree or arbitration award or
                  determination, or (d) give any party with rights under any
                  such instrument, agreement, mortgage, judgment, order, award,
                  decree or other restriction the right to terminate, modify or
                  otherwise change the rights or obligations of Siemens. Siemens
                  has full power and authority to do and perform all acts and
                  things required to be done by it under this Agreement.

         5.3      No Brokerage Fees. No person acting on behalf of Siemens has
                  any claim for a brokerage commission, finder's fee or other
                  like payment in connection with this Agreement.

         5.4      Intent. Siemens is acquiring the CTI Common Stock being
                  acquired by it hereunder, for its own account for the purpose
                  of investment and not with a view to the distribution or
                  resale thereof. Siemens understands that there is no present
                  market in such securities or in any other securities of CTI;
                  that no assurance can be given that any such market will
                  develop; and that, except as may be required pursuant to this
                  Agreement, CTI has no present intent to register its
                  securities under the Securities Act or the Exchange Act.

         5.5      Notification of Transfer. Siemens agrees that in no event will
                  it make a transfer or disposition of any of the CTI Common
                  Stock (other than pursuant to an effective registration
                  statement under the Securities Act), unless and until (a) it
                  shall have notified CTI of the proposed disposition and shall
                  have furnished CTI with a statement of the circumstances
                  surrounding the disposition, and (b) if requested by CTI, at
                  the expense of Siemens, or its transferee, it shall have
                  furnished to CTI an opinion of counsel, reasonably
                  satisfactory to CTI, to the effect that such transfer may be
                  made without registration under the Securities Act.

         5.6      Receipt of Information. Siemens represents and warrants that
                  it has heretofore discussed with CTI its plans, operations,
                  and financial condition and has heretofore received all such
                  information concerning the business and financial condition of
                  CTI as it has requested.

6.       COVENANTS OF CTI.

         6.1      Financial Statements. As long as Siemens or any transferee
                  Affiliate, if any (herein "Stockholder"), continues to hold
                  any of the CTI Common Stock, CTI shall:

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                  6.1.1    Furnish Stockholder within sixty (60) days after the
                           end of each quarter of each fiscal year of CTI a
                           balance sheet of CTI as at the end of such period,
                           and a statement of income, expense and net earnings
                           of CTI for the period from the beginning of the
                           fiscal year to the date of such statement, prepared
                           in accordance with generally accepted accounting
                           principles applied on a consistent basis and in
                           reasonable detail. Each such balance sheet and
                           statement shall set forth in comparative form in
                           corresponding figures as at the end of and for the
                           corresponding period one (1) year prior thereto, and
                           each shall be certified as true, complete and correct
                           (subject to adjustment upon year-end audit) by the
                           chief financial officer of CTI.

                  6.1.2    Furnish Stockholder as soon as practicable, but in
                           any event within one hundred twenty (120) days after
                           the end of each fiscal year, a copy of CTI 's annual
                           audited financial statements, which shall include
                           among other things a balance sheet as at the end of
                           such fiscal year and a statement of income, expense
                           and net earnings for such year in reasonable detail,
                           which balance sheet and statement shall set forth in
                           each case in comparative form the corresponding
                           figures for the previous year and shall be certified
                           by CTI's independent public accountants; and

                  6.1.3    Deliver to Stockholder such financial statements,
                           reports and other information as CTI shall send from
                           time to time to its other stockholders who are not
                           officers or directors of CTI. In the event CTI owns
                           subsidiaries with respect to which it files
                           consolidated tax returns, the financial statements
                           referred to in Paragraphs 6.1.1 and 6.1.2 above may
                           be prepared on a consolidated basis with such
                           subsidiaries.

         6.2      Access. CTI will permit representatives of Siemens, at
                  Siemens' expense, to visit and inspect any of the properties
                  of CTI or its subsidiaries and to discuss the affairs,
                  finances and accounts of CTI and its subsidiaries with their
                  respective officers, at such reasonable times and with such
                  reasonable frequency as Siemens may request.

         6.3      Non-Competition. Until the expiration of three (3) years after
                  the date of the sale by CTI of at least twenty five percent
                  (25%) or more of its direct or indirect equity ownership in
                  CPS, CTI and its Affiliates shall not participate in any
                  business competitive with the CPS Business, as defined in
                  Section 1.4 of the Reorganization Agreement, whether for its
                  own account or as a partner, joint venturer, agent,
                  stockholder of a corporation (other than a beneficial owner of
                  less than one percent (1%) of the outstanding voting stock
                  thereof), directly or indirectly, or otherwise, except for
                  such peripheral and OEM equipment as may be mutually agreed by
                  the parties hereto, such agreement not to be unreasonably
                  withheld.

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                  The activities of CTI contemplated in Section 12.1 of the
                  Reorganization Agreement shall not be deemed to violate this
                  paragraph.

7.       COVENANTS OF MANAGEMENT. Each Management Person agrees to vote his or
         her shares of CTI Common Stock, and to vote as a director of CTI and
         CPS in a manner consistent with the terms of this Agreement and the
         Reorganization Agreement. Specifically, for so long as Siemens and any
         of its Affiliates, in the aggregate, holds more than twenty percent
         (20%) of the outstanding Group Common Stock, Siemens shall be entitled
         to designate one of the Siemens designee board members of Group for
         election to the Board of Directors of CTI, and Management agrees to
         vote its shares of CTI Common Stock for the election of such designee.

8.       COVENANTS OF SIEMENS. Siemens acknowledges that it is Management's
         intention that CTI expand into new businesses peripheral to Group. The
         businesses which Management intends to cause CTI to develop include
         F-18 Distribution Centers, Position Emission Tomography ("PET")
         Diagnostic Centers, PET Detector Systems, PET Chemistry Systems and
         other related businesses, which shall not be competitive with the CPS
         Business. The parties acknowledge that CTI will likely require new
         capital to develop these businesses, and that the shareholders of CTI
         may require further liquidity in the future. Siemens agrees that it
         will not oppose future CTI capitalization efforts.

9.       RIGHT OF FIRST REFUSAL. If Siemens (the "Selling Stockholder") desires
         to sell any of its CTI Common Stock to any party rather than (A) an
         Affiliate of Siemens, (B) any general or limited partnership in which
         Siemens or an Affiliate of Siemens is a partner, or (C) any Management
         Person, then:

         9.1      The Selling Stockholder shall give notice to CTI of any
                  transactions covered by this Section 9. The notice shall
                  include (A) the name, address and principal business activity
                  of the prospective purchaser; (B) the number of shares of
                  stock proposed to be sold; (C) the manner in which the sale is
                  proposed to be made (including the proposed closing date); and
                  (D) the price at which, or other consideration for which, and
                  the material terms upon which, such sale is proposed to be
                  made, and stating that such proposed sale is, to the best of
                  the Selling Stockholder's knowledge, bona fide.

         9.2      During the thirty (30) day period commencing on the date CTI
                  receives the Selling Stockholder's notice, CTI shall have the
                  right to acquire all but not less than all of the shares of
                  CTI Common Stock proposed to be sold by the Selling
                  Stockholder in such transaction. Such right shall be exercised
                  if at all, by an irrevocable notice of exercise given by CTI
                  and received by CTI prior to the expiration of such period,
                  accompanied by a statement that CTI shall pay the Selling
                  Stockholder in accordance with the terms provided for in the
                  proposed transaction.

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         9.3      It CTI shall exercise its rights under this Section 9, the
                  Selling Stockholder shall deliver certificates duly endorsed
                  for transfer representing the shares of CTI Common Stock
                  purchased CTI in accordance with the terms specified in such
                  notice against receipt of payment therefor.

         9.4      The closing shall occur on the date specified in the Selling
                  Stockholder's notice.

         9.5      If the conditions prescribed in this Section 9 have been met
                  in connection with the proposed sale of CTI Common Stock by
                  the Selling Stockholder and CTI has not elected to exercise
                  its right of first refusal hereunder, then Siemens shall be
                  free to effect such sale for a period of one hundred eighty
                  (180) days following the date of the notice given under
                  Paragraph 9.1 hereof, but only, to the person or persons
                  specified in such notice and at the price (or for the
                  consideration) and on substantially the same terms specified
                  therein, but the CTI Common Stock proposed to be sold will
                  continue to be subject to this Agreement to the same extent as
                  if such notice had not been given.

10.      SALE OF CTI COMMON STOCK BY MANAGEMENT. So long as Siemens owns a least
         one percent (1%) of the issued and outstanding CTI Common Stock, and
         provided that at such time there has been no public offering of CTI
         Common Stock, if at any time any Management Person wishes to sell any
         of his CTI Common Stock, he shall first notify both Siemens and CTI of
         his intention to do so, to enable them to offer a competitive bid for
         his CTI Common Stock. Provided, however, that this Paragraph 10 shall
         not be construed as a right of first refusal or a requirement that the
         Management Person sell his shares to Siemens or CTI.

11.      REGISTRATION RIGHTS.

         11.1     Participation Registrations. CTI agrees that, if it shall at
                  any time propose to file, for the sale by management or by CTI
                  shares of CTI Common Stock, a registration statement under the
                  Securities Act on Form S-1, S-2, or S-3 (or a comparable new
                  form) (but excluding registration statements for employee
                  benefit plans or transactions of the nature contemplated by
                  Rule 145, promulgated under the Securities Act), CTI shall
                  give written notice of such intention at least twenty (20)
                  days prior to the proposed filing date to Siemens and shall
                  include in such registration statement the number of shares of
                  CTI Common Stock as Siemens shall request be so included.

         11.2     Obligations of CTI. As to the registration statement referred
                  to in Paragraph 11.1 above, CTI shall:

                  (a)      Use its best efforts to have such registration
                           statement declared effective as promptly as
                           reasonably practicable and will promptly notify
                           Siemens and its underwriters, if any, and confirm
                           such

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                           advice in writing, (A) when such registration
                           statement has become effective, (B) when any
                           post-effective amendment to any such registration
                           statement becomes effective and (C) of any request by
                           the SEC for any amendment or supplement to such
                           registration statement or any prospectus relating
                           thereto or for additional information; and

                  (b)      Furnish to Siemens or the underwriters such
                           reasonable number of copies of any prospectus
                           (including any preliminary prospectus) as Siemens may
                           reasonably request in order to effect the offering
                           and sale of CTI Common Stock being offered and sold
                           by Siemens and its Affiliates, but only while CTI is
                           required under the provisions hereof to cause the
                           registration statement to remain current; and

                  (c)      CTI shall use its best efforts to cause CTI Common
                           Stock included in the registration statement to
                           qualify for sale under the "blue sky" laws of such
                           states as Siemens may reasonably request; provided,
                           however, CTI shall not be required to qualify in more
                           than ten (l0) states unless Siemens agrees to
                           reimburse CTI for its expenses relating to additional
                           states; and

                  (d)      If at any time the SEC should institute or threaten
                           to institute any proceedings for the purpose of
                           issuing, or should issue a stop order suspending the
                           effectiveness of any such registration statement, CTI
                           will promptly notify Siemens and will use its best
                           efforts to prevent the issuance of any such stop
                           order or to obtain the withdrawal thereof as soon as
                           possible. CTI shall advise Siemens promptly of any
                           order or communication of any public board or body
                           addressed to CTI suspending or threatening to suspend
                           the qualification of any of the CTI Common Stock
                           offered for sale in any jurisdiction.

         11.3     Expenses. Except as provided in this Section 11, the entire
                  cost and expense of all of the registrations pursuant to
                  Paragraph 11.1 and the state qualifications related thereto
                  pursuant to Paragraph 11.2(c) shall be borne by CTI. The costs
                  and expenses of any such registrations and qualifications
                  shall include the fees and expenses of CTI's counsel and its
                  accountants and all other out-of-pocket costs and expenses of
                  CTI incident to the preparation, printing and filing under the
                  Securities Act of the registration statement and all
                  amendments and supplements thereto and the cost of furnishing
                  copies of each preliminary prospectus, each final prospectus
                  and each amendment or supplement thereto to underwriters,
                  dealers and other purchasers of the securities so registered,
                  the costs and expenses incurred in connection with the
                  qualification of such CTI Common Stock so registered under the
                  "blue sky" laws of various jurisdictions and all other costs
                  and expenses of complying with the

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                  foregoing provisions of this section; provided, however, that
                  under no circumstances shall CTI be liable or responsible for
                  the fees and expenses of Siemens' counsel for any registration
                  pursuant to Paragraph 11.1 above or for underwriting discounts
                  and commissions and transfer taxes payable in connection with
                  any sale of CTI Common Stock owned by Siemens and included in
                  a registration statement.

         11.4     Indemnification. CTI hereby indemnifies and agrees to hold
                  harmless Siemens and its Affiliates, any underwriter (as
                  defined in the Securities Act) for Siemens or its Affiliates,
                  any broker or dealer to or through whom Siemens or its
                  Affiliates sell CTI Common Stock that may be deemed to be an
                  underwriter and each person, if any, that controls Siemens or
                  its Affiliates or any such underwriter, broker or dealer
                  against claims, damages or liabilities, joint or several, to
                  which any such persons may be subject, under the Securities
                  Act or otherwise, and to reimburse any of such persons for any
                  legal or other expenses incurred in connection with
                  investigating or defending against any such losses, claims,
                  damages or liabilities, insofar as such losses, claims,
                  damages or liabilities arise out of or are based upon any
                  untrue statement or alleged untrue statement of a material
                  fact contained in any registration statement under which such
                  CTI Common Stock was registered under the Securities Act
                  pursuant to this Section 11, any prospectus contained therein,
                  or any amendment or supplement thereto, or arise out of or are
                  based upon the omission or alleged omission to state therein a
                  material fact required to be stated therein or necessary to
                  make the statements therein not misleading, except insofar as
                  such losses, claims, damages or liabilities arise out of or
                  are based upon information furnished to CTI in writing by
                  Siemens or its Affiliates or any underwriter for Siemens or
                  its Affiliates specifically for use therein. By requesting
                  registration under this Section 11, Siemens will be deemed
                  thereby to indemnify and to have agreed to hold harmless CTI
                  and its directors and officers and each person, if any, who
                  controls CTI within the meaning of the Securities Act against
                  any losses, claims, damages or liabilities, joint or several,
                  to which any of such persons may be subject under the
                  Securities Act or otherwise, and to reimburse any of such
                  persons for any legal or other expenses incurred in connection
                  with the investigation or defense against any such losses,
                  claims, damages or liabilities, joint or several, to which any
                  of such persons may be subject under the Securities Act or
                  otherwise, and to reimburse any of such persons for any legal
                  or other expenses incurred in connection with the
                  investigation or defense against any such losses, claims,
                  damages or liabilities, but only to the extent caused by an
                  untrue statement or alleged untrue statement or omission or
                  alleged omission of a material fact in any registration
                  statement under which the shares of CTI Common Stock were
                  roistered under the Securities Act pursuant to this Section
                  11, any prospectus contained therein, or any amendment or
                  supplement thereto, which was based upon and in conformity
                  with information furnished to CTI in writing by Siemens or its
                  Affiliates expressly for use therein.

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         11.5     Participation by Siemens. CTI will permit counsel and
                  representatives of Siemens to participate in meetings in
                  connection with the preparation of the registration statement.
                  The presence of Siemens' counsel or other representative shall
                  not alter the rights to indemnification noted in the preceding
                  Paragraph 11.4. CTI shall promptly deliver to Siemens copies
                  of the registration statement and amendments thereto as filed
                  with the SEC, and upon the effectiveness of the registration
                  statement such number of copies of the prospectus included in
                  such registration statement as Siemens may reasonably request.

         11.6     Obligations of Siemens. As to the registration statement
                  referred to in Paragraph 11.1 above, Siemens will provide CTI
                  with a description of the proposed method or methods of
                  distribution of CTI Common Stock as from time to time
                  contemplated by Siemens and CTI shall include such description
                  in the registration statement and file any and all amendments
                  and supplements necessary in connection therewith.

12.      SPECIFIC PERFORMANCE. The parties recognize that, because of the nature
         of the subject matter of this Agreement, it would be impracticable and
         extremely difficult to determine actual damages in the event of breach
         of this Agreement. Accordingly, if any party commits a breach, or
         threatens to commit a breach, of any of the provisions of Sections 2,
         6, 7, 8, 9, 10 or 11, the other parties shall have the right to seek
         and receive a temporary restraining order, injunction or other
         equitable remedy, including, without limitation, the right to have the
         provisions of this Agreement specifically enforced by any court having
         equity jurisdiction, it being acknowledged and agreed that any such
         breach or threatened breach will cause irreparable injury and that
         money damages will not provide an adequate remedy.

13.      MISCELLANEOUS.

         13.1     Expenses. Except as otherwise provided herein, each party
                  shall pay its own expenses incurred in connection with this
                  Agreement and the transactions contemplated hereby.

         1.3.2    Successors; Assignment. This Agreement shall be binding upon
                  and shall inure to the benefit of and be enforceable by the
                  successors of the parties hereto. Except as otherwise provided
                  herein, this Agreement shall not be assignable. Siemens shall
                  have the right to transfer all or any of the CTI Common Stock
                  owned by it to any Affiliate of Siemens; provided, however,
                  that such Affiliate of Siemens shall agree in advance in
                  writing to be bound by all the terms of this Agreement. In
                  such case, the Affiliate of Siemens shall be entitled to
                  enforce as against CTI and Management all of the terms and
                  conditions of this Agreement to the same extent as this
                  Agreement could be enforced by Siemens, but Siemens shall
                  remain bound by the terms of this Agreement.

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         13.3     Entire Agreement; Amendment. This Agreement and the
                  Reorganization Agreement and the exhibits hereto set forth the
                  entire understanding between the parties with respect to their
                  respective subject matters. They may not be modified, amended,
                  altered or supplemented and no provision may be waived except
                  by a written agreement signed by the parties thereto which
                  shall be authorized by all necessary corporate action of each
                  party.

         13.4     Survival of Representations, Warranties and Covenants. All
                  representations, warranties, covenants and agreements made
                  herein shall survive the execution and delivery of this
                  Agreement and the purchase and sale of the CTI Common Stock
                  provided for hereunder.

         13.5     Notices. All notices, requests, claims, demands and other
                  communications hereunder shall be in writing and shall be
                  given by personal delivery, cable, telegram or telex, or by
                  mail (registered or certified mail, postage prepaid, return
                  receipt requested) to the respective parties as follows:

                  If to Group:

                                 CTI Group, Inc.
                                 810 Innovation Drive
                                 Knoxville, Tennessee 37922
                                 Attention:  Terry D. Douglass

                  If to CTI:

                                 CTI, Inc.
                                 810 Innovation Drive
                                 Knoxville, Tennessee 37922
                                 Attention:  Terry D. Douglass

                                 with a copy to:

                                 Dennis R. McClane, Esq.
                                 Baker, Worthington, Crossley,
                                     Stansberry & Woolf
                                 530 Gay Street, S.W.
                                 P.O. Box 1792
                                 Knoxville, Tennessee 37901

                  If to Siemens, to:

                                 Siemens Gammasonics, Inc.
                                 2000 Nuclear Drive
                                 Des Plaines, Illinois 60818
                                 Attention:  President

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                                 with a copy to:

                                 General Counsel
                                 Siemens Capital Corporation
                                 767 Fifth Avenue
                                 New York, New York 10153

                  or to such other address as either party may have furnished to
                  the other in writing in accordance herewith.

         13.6     Applicable Law. This Agreement shall be governed by and
                  construed in accordance with the substantive law of the State
                  of Tennessee.

         13.7     Counterparts; Headings. This Agreement may be executed in
                  several counterparts, each of which shall be an original, but
                  all of which together shall constitute one and the same
                  agreement. The headings contained in this Agreement are solely
                  for the convenience of the parties, and are not intended to
                  and do not limit; construe or modify any of the terms and
                  conditions hereof.

         13.8     Confidential Information. Each party agrees that such party
                  and its representatives will hold in strict confidence all
                  information and documents received from the other parties;
                  provided, however, that each party's obligations hereunder to
                  maintain such confidentiality shall not apply to any
                  information or documents that are in the public domain at the
                  time furnished by the other or that become in the public
                  domain thereafter through any means other than as a result of
                  any act of the receiving party or of its employees, agents,
                  officers or directors.

         13.9     Publicity. The parties agree that no publicity, release or
                  other public announcement concerning the transactions
                  contemplated by this Agreement shall be issued by any part
                  without the advance approval of both the form and substance of
                  the same by the other parties and their counsel, which
                  approval, in the case of any publicity, release or other
                  public announcement required by applicable law, shall not be
                  unreasonably withheld or delayed.

         13.10    Invalidity. If any one or more of the provision or any part
                  thereof contained in this Agreement shall for any reason be
                  held to be invalid, illegal, or unenforceable in any respect,
                  such invalidity, illegality, or unenforceability shall not
                  affect the remaining provisions or parts thereof of this
                  Agreement and this Agreement shall be construed in such a way
                  and to the extent permitted by law to give effect to the
                  intent of such provision or part thereof.

         13.11    Waiver. The failure of any party to exercise any of its rights
                  hereunder or to enforce any of the terms or conditions of this

                                       12
<PAGE>

                  Agreement on any occasion shall not constitute or be deemed a
                  waiver of that party's rights thereafter to exercise any
                  rights hereunder or to enforce each and every term and
                  condition of this Agreement.

         IN WITNESS WHEREOF, the parties have executed this Agreement as of the
date first above written.

ATTEST:                                  CTI GROUP, INC.,

/s/ Michael C. Crabtree                  By:   /s/ Terry D. Douglass
-----------------------------------          -----------------------------------
                                                Terry D. Douglass
Title: Vice President                           President
       ----------------------------

ATTEST:                                  CTI, INC.,

/s/ Michael C. Crabtree                  By:  /s/ Terry D. Douglass
-----------------------------------          -----------------------------------
                                                Terry D. Douglass
Title: Vice President                           President
      -----------------------------

Witness:

/s/ Dennis R. McClane                     /s/ Terry D. Douglass
-----------------------------------      ---------------------------------------
                                         Dr. Terry D. Douglass

Witness:

/s/ Dennis R. McClane                     /s/ Ronald Nutt
-----------------------------------      ---------------------------------------
                                         Dr. Ronald Nutt
Witness:

/s/ Dennis R. McClane                     /s/ Michael C. Crabtree
-----------------------------------      ---------------------------------------
                                         Michael C. Crabtree

                                       13
<PAGE>

Witness:

/s/ Dennis R. McClane                     /s/ J. Kelly Milam
-----------------------------------      ---------------------------------------
                                         J. Kelly Milam

ATTEST:                                  Siemens Gammasonics, Inc.

                                         By: /s/ Gregory J. Barone
-----------------------------------          -----------------------------------

Title: Exec. V.P.                        Title:  President
      -----------------------------              -------------------------------

                                       14<PAGE>
                                                                   EXHIBIT 10.51
(*)

                                   (*) AND (*)

                                    CONTRACT
                                     BETWEEN
                (*) AND *, HEREINAFTER COLLECTIVELY CALLED "SELLER"
                                       AND
                     CTI, INC., HEREINAFTER CALLED "BUYER".

BUYER, a Tennessee corporation, having its principal office at 810 Innovation
Drive, Knoxville, Tennessee 37932, agrees to purchase from SELLER, and SELLER
agrees to sell to BUYER, Virgin Product and Recycled Product, as defined herein,
and BUYER agrees to supply to SELLER, and SELLER agrees to accept, Scrap
Product, as defined herein, all upon the following terms and conditions:

TERM: From: January 1, 2000 through: December 31, 2004 (the "Initial Term"), and
thereafter this Contract will automatically renew for additional successive
Terms of two years each (the "Renewal Term(s)"), unless and until terminated as
of the end of the Initial Term or any Renewal Term by either party by written
notice given at least six (6) months prior to the end of the then current Term.
BUYER shall have the right to terminate this Contract at any time upon no less
than six (6) months' prior written notice if a price increase due to Superfund
or similar taxes is unacceptable to BUYER.

PRODUCT: Virgin and recycled (*,) having the specifications set forth in Exhibit
A attached hereto (the "Product"). Any modification to the specifications for
either Product must be in writing and signed by SELLER and BUYER.

SCRAP/RECYCLED PRODUCT: BUYER will provide to SELLER, at no charge to SELLER,
CIP (Incoterms '90) SELLER's (*), France, plant, one hundred percent (100%) of
the scrap Product produced by BUYER during the Term, having the specifications
set forth in Exhibit B attached hereto ("Scrap Product") for recycling by SELLER
for sale to BUYER. Any modification to the specifications must be in writing and
signed by SELLER and BUYER.

QUANTITY: (a) Virgin Product: ninety-five percent (95%) of BUYER's requirements
for virgin Product ("Virgin Product") in each calendar year during the Term;
however, not in excess of SELLER's production capacity for Virgin Product at its
(*), France, plant, estimated at ten (10) metric tons of Product per calendar
year as of the date of this Contract; and (b) Recycled Product: one hundred
percent (100%) of SELLER's production of Recycled Product; however, not in
excess of SELLER's production capacity for Recycled Product at its (*), France,
plant, estimated at ten (10) metric tons per calendar year upon completion of
installation of its new recycling unit (see RIDER 1). If at any time BUYER
requires in excess of any such quantities, SELLER will have a right of first
refusal to supply such excess quantities; provided that SELLER shall not be in

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
file separately with the Securities and Exchange Commission.
<PAGE>

breach of this Contract if it is unable to supply or make timely deliveries of
such excess. See RIDER 1.

PRICE: The prices for Virgin Product throughout the Initial Term, EXW (Incoterms
'90) SELLER's warehouse at Brook, New Jersey, U.S.A., are:

<TABLE>
<CAPTION>
          Price Per Tier                      Quantities Purchased During the Initial Term
       -------------------                    --------------------------------------------
       <S>                                    <C>
       $ (*) per kilogram                     (*)
       $ (*) per kilogram
       $ (*) per kilogram
</TABLE>

The prices for Recycled Product throughout the Initial Term, EXW (Incoterms '90)
SELLER's warehouse at Brook, New Jersey, U.S.A., are:

<TABLE>
<CAPTION>
          Price Per Tier                      Quantities Purchased During the Initial Term
       -------------------                    --------------------------------------------
       <S>                                    <C>
       $ (*) per kilogram                     (*)
       $ (*) per kilogram
       $ (*) per kilogram
</TABLE>

The above prices and quantities are on a cumulative basis for all purchases
throughout the Initial Term. The price for purchases in each tier commencing
with the first tier will remain the same irrespective of the total quantity
purchased. Purchases in each tier must be completed before the prices in the
next following tier will apply to further purchases. The above prices are firm
throughout the initial Term, subject to a hardship condition pursuant to
Paragraph 11. of the General Terms and Conditions of Sale attached hereto. After
expiration of the Initial Term, prices are subject to adjustment. Superfund and
similar taxes imposed in the future may be added to the prices to Buyer.

PURCHASE ORDER: BUYER will provide SELLER, no later than October 1 of the
preceding calendar year, with annual purchase orders for its requirements for
Products in the next succeeding calendar year ("Annual P.O."). For the first
calendar year of the Initial Term, BUYER will provide SELLER with an Annual P.O.
upon signature of the Contract. In addition, each calendar quarter, BUYER will
provide SELLER with an updated delivery schedule for Products during the
forthcoming three-month period (the "Rolling Delivery Schedule"). If the Annual
P.O and/or any Rolling Delivery Schedule is not consistent with the provisions
of this Contract, then SELLER's prior written agreement with the inconsistent
portions of such P.O and/or Schedule is required. If BUYER forecasts that the
Rolling Delivery Schedule will increase by more than ten percent (10%) of the
quantity scheduled far delivery, BUYER will give SELLER no less than thirty (30)
days written notice of such increase. SELLER will rely on the Annual P.O. and
the applicable Rolling Delivery Schedule to maintain in its Brook, New Jersey,
warehouse, the inventory of Products to be supplied to BUYER in accordance with
the Rolling Delivery Schedule. If BUYER requires Products on an expedited basis
or not in accordance with the applicable Rolling Delivery Schedule or BUYER has
not given SELLER at least thirty (30) days notice of an increase in the Rolling
Delivery Schedule,

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

SELLER may invoice BUYER for any increased costs incurred by SELLER in making
such deliveries.

DELIVERY: Deliveries will be made in accordance with BUYER's purchase orders or
releases.

TERMS: Net thirty (30) days from date of SELLER'S invoice.

OTHER CONDITIONS:

RIDER 1, EXHIBITS A AND B and the GENERAL TERMS AND CONDITIONS OF SALE attached
hereto are hereby agreed to and made a part of and incorporated in this
Contract. ANY ADDITIONAL OR DIFFERENT TERMS OR CONDITIONS IN BUYER'S PURCHASE
ORDERS, OTHER DOCUMENTS OR OTHERWISE WILL BE OF NO FORCE OR EFFECT EXCEPT TO THE
EXTENT EXPRESSLY SET FORTH IN WRITING AND SIGNED BY SELLER AND BUYER. THIS
CONTRACT SUPERSEDES ALL PRIOR CONTRACTS RELATING TO THE SUBJECT MATTER HEREOF.

CTI, INC.                              (*)

By:    /s/ Ronald Nutt                 By:  /s/
   ---------------------------              ------------------------------------
Title: Senior Vice President                President, (*), on
      ------------------------                  behalf of (*), a wholly-owned
Date:  March 17, 2000                  Title:   subsidiary of
      ------------------------                  --------------------------------

                                       Date:    3/12/2000
                                                --------------------------------
                                       (*)

                                       By:      /s/      (*)
                                            ------------------------------------

                                       Title:   President
                                                --------------------------------
                                       Date:    February 28, 2000
                                                --------------------------------

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                                     RIDER 1

1.       SELLER'S RECYCLED PRODUCT PRODUCTION CAPACITY. Upon execution of this
         Contract by both parties, SELLER will proceed with the installation of
         a new Scrap Product recycling unit, having specifications determined by
         SELLER, at SELLER's plant in (*), France.

2.       DEDICATED SUPPLY OF THE PRODUCTS. It is understood between the parties
         that (a) SELLER has worked with BUYER over the past five years in the
         use of the Product to assist BUYER in the development of BUYER'S new
         propriety positron emission tomography medical scanning equipment (the
         "PET Scanner"), (b) BUYER is ready far commercial production of the PET
         Scanner and wishes to be assured of a guaranteed source of supply of
         the Product which constitutes a key raw material needed in the full
         scale production of the PET Scanner, and (c) SELLER has made a
         significant capital investment to increase its production capacity of
         Virgin Product to meet BUYER'S anticipated demand under this Contract,
         and further, in reliance on sales of Recycled Product under this
         Contract, intends to make additional capital investment to purchase and
         install a new production unit to recycle Scrap Product into Recycled
         Product for supply to BUYER. For the foregoing reasons, SELLER agrees
         that, during the Initial Term of this Contract, SELLER will not
         knowingly make commercial sales to any third party other then BUYER of
         Virgin Products and Recycled Products for use in BUYER'S Field of Use
         (the "Exclusivity Obligation"). BUYER'S "Field of Use" is defined as
         the production of scintillating crystals, ceramics and glasses for use
         in the manufacture of medical imaging equipment. SELLER will,
         notwithstanding, have the right to use the Products for research and
         development purposes in all fields of use and/or to make commercial
         sales of Virgin Products and Recycled Products far use in any field of
         use other than BUYER'S Field of Use. Notwithstanding the foregoing, in
         the event BUYER'S combined purchases of Virgin Products and Recycled
         Products from the effective date of this Contract through the third
         calendar year of the Initial Term, total no more than thirty (30)
         metric tons, then SELLER will have the right, in its sole discretion,
         to unilaterally terminate its Exclusivity Obligation effective as of
         the end of the third calendar year of the Initial Term or at any time
         thereafter. Combined purchases referred to in the foregoing sentence
         will include the quantities of Products covered by purchase order
         issued by BUYER and received by SELLER before the end of the third
         calendar year of the Initial Term for deliveries to BUYER within 180
         days after the date of the purchase order. In any event, SELLER'S
         Exclusivity Obligation will terminate automatically at the end of the
         Initial Term, unless SELLER determines, in its sole discretion, to
         extend its Exclusivity Obligation for an additional period of time.
         SELLER'S determination will be based on BUYER'S projected requirements
         for the Products. Notwithstanding, after the Initial Term SELLER shall
         have the right, in its sole discretion, to terminate its Exclusivity
         Obligation at any time.

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

3.       SCRAP/RECYCLED PRODUCT. SELLER will provide BUYER with a 78% yield on
         total (*) content from the Scrap Product (corresponding to a 90% yield
         on recovery of (*) only). SELLER reserves the right to revise the
         foregoing recovery yield at the end of the third calendar year of the
         Initial Term based on the actual average recovery yield experienced by
         SELLER. The revised recovery yield will apply only during the fourth
         and fifth calendar years of the Initial Term. BUYER will ship to SELLER
         Scrap Product once every calendar quarter, BUYER will at the same time
         issue a purchase order to SELLER for Recycled Product totaling 78% of
         the quantity of Scrap Product shipped by BUYER.

4.       CONFIDENTIALITY. BUYER and SELLER agree that the terms and conditions
         of the supply arrangement between BUYER and SELLER and any technical
         and business information disclosed by either party to the other party
         in the course of the relationship between them created by this Contract
         shall be deemed "Confidential Information" subject to the terms and
         conditions of the Joint Confidentiality Agreement between the parties
         dated June 20, 1996 (the "Joint Confidentiality Agreement"). BUYER
         agrees that it shall not disclose this Contract nor the relationship
         between BUYER and SELLER to any third party, except with the prior
         written consent of SELLER which consent may be granted or withheld in
         SELLER's sole discretion. It is hereby further agreed by BUYER and
         SELLER that the Joint Confidentiality Agreement should remain in full
         force and effect and that Paragraph 13. of said Joint Confidentiality
         Agreement be, and it is hereby, deleted in its entirety and replaced
         with the following paragraph:

         "13.     This Agreement shall terminate upon termination or expiration
                  of that certain Contract dated January 1, 2000, between the
                  parties, providing for the supply of (*) to CTI; provided,
                  however, that Recipient's obligations set forth in Paragraphs
                  4. and 5. hereof shall survive the termination or expiration
                  for any reason of this Agreement."

5.       RESOLUTION OF DISPUTES:

         A.       NEGOTIATION BY SENIOR EXECUTIVES.

         (a)      The parties shall attempt in good faith to resolve any dispute
         arising out of or relating to this Agreement promptly by negotiation
         between senior executives who have authority to settle the controversy
         and who are at a higher level of management than the persons with
         direct responsibility for administration of this Agreement. Any party
         may give the other party written notice of any dispute not resolved in
         the ordinary course of business. Within fifteen (15) days after
         delivery of the notice the party receiving the notice shall submit to
         the other a written response.

         (b)      The notice and the response shall include: (1) a statement of
         each party's position regarding the matter in dispute and a summary of
         arguments in support

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

         thereof, and (ii) the name and title of an executive who will represent
         that party and any other person who will accompany that executive.
         Within thirty (30) days after delivery of the notice, the designated
         executives shall meet at a mutually acceptable time and place, and
         thereafter as often as they reasonably deem necessary, to attempt to
         resolve the dispute. All reasonable requests for information made by
         one party to the other shall be honored in a timely fashion.

         (c)      If the matter in dispute has not been resolved within sixty
         (60) days after delivery of the notice, or if the parties fall to meet
         within thirty (30) days, either party may initiate mediation
         proceedings as provided below.

         B.       MEDIATION. If the dispute has not been resolved within sixty
         (60) days after delivery of the notice referred to above, the dispute
         shall be submitted to non-binding mediation in accordance with the
         Rules of the Center for Public Resources Institute for Dispute
         Resolution. The parties shall mediate in good faith in an effort to
         resolve the dispute. The place of mediation will be New York, New York,
         or such other location agreed to by the parties. Mediation costs shall
         be shared equally by the parties. If the dispute is not resolved by the
         mediation process within sixty (60) days after commencement, either
         party may initiate litigation.

         C.       CONFIDENTIALITY. All negotiations and proceedings conducted
         pursuant to this Article (and any of the parties' submissions in
         contemplation hereof) shall be kept confidential by the parties and
         shall be treated by the parties and their respective representatives as
         compromise and settlement negotiations for purposes of the Federal
         Rules of Evidence and any similar state rules.
<PAGE>

                                    EXHIBIT A

                        SPECIFICATIONS FOR VIRGIN PRODUCT

The specifications for Virgin Product are set forth in the attached Page 2 of
Exhibit A executed by SELLER and BUYER.

                       SPECIFICATIONS FOR RECYCLED PRODUCT

The specifications for Recycled Product are set forth in the attached Page 3 of
Exhibit A executed by SELLER and BUYER.
<PAGE>

                                      (*)

             SPECIFICATION PROPOSAL REFERENCE: 7093 / CTI REVISION 2

                                CUSTOMER: C.T.I.

APPEARANCE: White odorless fine powder.

TECHNICAL CHARACTERISTICS:

(*):

(*)
(*)
(*)
(*)
(*)
(*)

(*)

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                                      (*)

SPECIFICATION PROPOSAL REFERENCE: 7093/ CTI REV. 2

CUSTOMER: C.T.I.

         2)       (*):

(*)
(*)
(*)

LOT SIZE: 250 kg.

PACKAGING: 50 kg metallic drum containing 5 x 10 kg plastic bags.
---------

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------
               Name        Quality              Signature            Date
<S>                    <C>                      <C>            <C>
Prepared by    (*)        Quality                /s/ (*)       Dec. 7th, 1999
                           Manager

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

Approved by    (*)     Market Director           /s/ (*)       Dec. 7th, 1999

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

Customer                   Crystal Growth
acceptance     (*)     Technology Mgr.           /s/ (*)        Dec. 10, 1999

-------------------------------------------------------------------------------
</TABLE>

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                                       (*)

             SPECIFICATION PROPOSAL REFERENCE: 7094 / CTI REVISION 0

                                CUSTOMER: C.T.I.

APPEARANCE: White odorless fine powder.
----------

TECHNICAL CHARACTERISTICS:
--------------------------

         1)      (*:)

(*)
(*)
(*)
(*)
(*)
(*)

(*)

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                                      (*)

SPECIFICATION PROPOSAL REFERENCE: 7094/ CTI REV. 0

CUSTOMER: C.T.I.

         2)       (*):

(*)
(*)
(*)

LOT SIZE: 250 kg.
---------

PACKAGING: 50 kg metallic drum containing 5 x 10 kg plastic bags.
----------

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------
               Name    Quality                Signature       Date
<S>                    <C>                    <C>           <C>
Prepared by    (*)     Quality                /s/ (*)       Dec. 7th, 1999
                       Manager

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

Approved by    (*)     Market Director        /s/ (*)       Dec. 7th, 1999

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

Customer               Crystal Growth
acceptance     (*)     Technology Mgr.        /s/ (*)        Dec. 10, 1999

-------------------------------------------------------------------------------
</TABLE>

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                                    EXHIBIT B
                        SPECIFICATIONS FOR SCRAP PRODUCT

Scrap Product to be provided by BUYER to SELLER will have the following
specifications:

         (*)      having no less than 87% (*) content and no more than five (5)
         parts per million ("PPM") of a combination of the elements Uranium
         ("U") and Thorium ("Th").

(*)      Omitted information is the subject of a request for confidential
treatment pursuant to Rule 406 under the Securities Act of 1933 and has been
filed separately with the Securities and Exchange Commission.
<PAGE>

                      GENERAL TERMS AND CONDITIONS OF SALE

1.       The price and terms herein specified may be adjusted by Seller at any
         time after expiration of the Initial Term by written notice from Seller
         dispatched at least thirty (30) days prior to the effective date of
         such adjustment. Buyer shall be deemed to have consented to such
         adjustment unless written rejection of the adjustment is given to
         Seller before the effective date thereof. Upon receipt of such
         rejection, Buyer and Seller will have thirty (30) days to reach
         agreement on the adjustment. If agreement is not reached within thirty
         (30) days, Buyer will have the right to terminate this Contract at any
         time thereafter upon thirty (30) days prior notice. Any such adjustment
         shall apply to all Products shipped by Seller hereunder on and after
         the effective date thereof unless subsequently again adjusted by
         Seller. In the event Seller is prevented by any governmental
         restriction from increasing any price herein or adjusting any term, or
         from continuing any price or term already in effect, Seller may
         terminate this Contract by written notice dispatched thirty (30) days
         prior to date of termination.

2.       Unless otherwise specified herein, deliveries shall be made in
         approximately equal monthly quantities.

3.       Each shipment shall constitute a separate and independent transaction
         and Seller may recover for each such shipment without reference to any
         other. If Buyer is in default with respect to any of the terms or
         conditions of this Contract, Seller may, at its option, defer further
         shipments hereunder until such default be remedied (in which event
         Seller may elect to extend the Contract period for a time equal to that
         for which shipments were so deferred), or, in addition to any other
         legal remedy, Seller may decline further performance of this Contract.
         If, in the sole judgment of Seller, the financial responsibility of
         Buyer shall at any time become impaired, Seller may decline to make
         further deliveries under this contact except upon receipt, before
         shipment, of payment in cash or satisfactory security for such payment.

4.       In case of bulk carload or tank car shipments, shipper's weight,
         certified to by sworn Weighmaster, shall govern.

5.       Determination of the suitability of the Products supplied hereunder for
         the uses and applications contemplated by Buyer and others shall be the
         sole responsibility of Buyer. All warranties by Seller pertaining to
         the Products are expressed in this paragraph. Seller warrants that upon
         delivery to Buyer the Products supplied hereunder meet the respective
         specifications expressly agreed upon in writing by the parties and
         attached hereto as Exhibit A. SELLER MAKES NO OTHER WARRANTIES OR
         REPRESENTATIONS OF ANY KIND WHATSOEVER WITH RESPECT TO THE PRODUCTS,
         EXPRESS OR IMPLIED, STATUTORY, BY OPERATION OF LAW OR OTHERWISE, AND
         SELLER EXPRESSLY DISCLAIMS ANY AND ALL WARRANTIES OF MERCHANTABILITY,
         FITNESS FOR A PARTICULAR PURPOSE AND SUITABILITY.

6.       BUYER ASSUMES ALL RISK AND LIABILITY (INCLUDING SAFETY, HEALTH AND
         ENVIRONMENTAL) FOR, AND WILL INDEMNIFY AND HOLD HARMLESS SELLER FROM,
         ALL LOSS, DAMAGE OR INJURY TO PERSONS AND PROPERTY RESULTING FROM THE
         UNLOADING, HANDLING, USE, STORAGE AND DISPOSAL OF THE PRODUCTS UPON AND
         AFTER DELIVERY TO BUYER, INCLUDING, WITHOUT LIMITING THE FOREGOING, THE
         USE OF SAID PRODUCTS ALONE OR IN MANUFACTURING PROCESSES, OR IN
         COMBINATION WITH OTHER SUBSTANCES,
<PAGE>

         INCLUDING ALL RISK AND LIABILITY WHATSOEVER FOR POLLUTION, HEALTH AND
         ENVIRONMENTAL DAMAGE, INJURY AND RESTORATION.

7.       Buyers exclusive remedy, and Seller's sole liability, on any claim with
         respect to the Products supplied hereunder, whether statutory, tort,
         negligence, strict liability, contract or warranty, shall be limited to
         rejection of any Product not in compliance with the specifications in
         Exhibit A and, at Seller's option, replacement of or reimbursement for
         such nonconforming Product as determined by the net price paid to
         Seller. No claim of any kind, whether as to Product delivered or for
         nondelivery or untimely delivery of Product, and whether arising in
         tort or Contract, shall be greater in amount than the purchase price of
         the Product in respect of which such damages are claimed; and the
         failure to give notice of claims within sixty (60) days from date of
         delivery, or the date fixed for delivery, as the case may be, shall
         constitute an unconditional waiver by Buyer of all claims in respect of
         such Product. In no event shall Seller be liable for incidental,
         special, indirect, consequential or punitive damages.

8.       All returnable containers used in making deliveries hereunder are
         Seller's property and shall be used by Buyer only for proper storage of
         Seller's Product originally delivered therein. Buyer shall make a
         deposit as security for the return of such containers, equal to
         Seller's current deposit charge therefor at the time of shipment. Such
         deposit shall be paid, without discount, when the invoice for the
         contents is paid. Buyer shall return such containers to Seller's
         shipping point within two months from the date of original shipment,
         whereupon Buyer shall be credited with the amount of the deposit. If
         Buyer fails to return the containers in good condition and within the
         time specified, Seller may refuse to accept the same and may retain
         said deposit.

9.       Buyer shall reimburse Seller for all taxes, excise or other charges
         which Seller may be required to pay to any government (national, state,
         provincial or local) upon, or measured by, the sale, production,
         transportation or use of any Product sold hereunder. Seller may at its
         option add to the price of Product sold hereunder the amount of any
         increase in transportation charges for shipments to Buyer, provided
         that such transportation charges are payable by Seller hereunder.

10.      Neither party shall be liable for its failure to perform or delay in
         performance hereunder if said performance is made impracticable or
         delayed due to any circumstances beyond the reasonable control of the
         party affected, including but not limited to, acts of God, fires,
         floods, wars, sabotage, accidents, labor disputes or shortages, plant
         shutdown, equipment failure, voluntary or involuntary compliance with
         any law, order, rule or regulation of government agency or authority,
         or inability to obtain material (including power and fuel), raw
         material, equipment or transportation. The affected party may omit
         purchases or deliveries during the period of continuance of such
         circumstances and the Contract quantity shall be reduced by the
         quantities so omitted. During any period when Seller shall be unable to
         supply the total demands for any Product provided for in this Contract,
         caused by the circumstances specified above, Seller may allocate any
         available Product among all buyers, including its own divisions and
         departments, on such basis as it may deem fair and practical.
         Notwithstanding the foregoing, the provisions of this paragraph shall
         not apply to obligations to make payments due under this Contract.

11.      Notwithstanding any other provision in this Contract; if during the
         Initial Term Seller experiences an economic hardship, which is hereby
         defined as an increase of more than twenty percent (20%) in Seller's
         costs to procure the raw materials necessary to produce
<PAGE>

         the Products, over Seller's costs as of the effective date of this
         Contract to procure such raw materials (the "Hardship"), then Seller
         shall have the right to pass through to Buyer by increasing the prices
         of the affected Products by that amount which represents the excess
         over 20% of such increase in Seller's costs to procure the raw
         materials required to produce the affected Products. Buyer shall have
         the right to terminate this Contrast upon at least sixty (60) days
         prior written notice to Seller if said price increase results in a
         price than is twenty percent (20%) or more higher than the price
         offered by another manufacturer for the product having the same
         specifications as Seller's Product, of the same or equal quality, in
         volumes no less than one full current year under this Contract and on
         the same or comparable terms and conditions as provided to Buyer under
         this Contract. At any time within six (6) months of Seller's notice to
         Buyer of a price increase for a condition of Hardship, Buyer may have
         an audit performed to verify the accuracy of the Hardship price
         increase; provided, however, such audit shall be conducted only upon
         the following terms and conditions. Such audit shall be performed by a
         certified public accountant who is a member of a recognized national
         public accounting firm acceptable to both Buyer and Seller (the
         "Accountant"). The Accountant shall execute on behalf of Seller a
         confidentiality agreement in which the Accountant and the Accountant's
         firm agree that the Accountant will not disclose to Buyer or any other
         third party any information whatsoever which he or she obtained in the
         course of the audit, except for the Accountant's summary conclusion
         that Seller's calculation of the Hardship price increase complies or
         does not comply with the terms of this Paragraph 11., and, if the
         Accountant determines that the price increase is not in compliance with
         this Paragraph, the net amount by which the Accountant deems Seller's
         calculation to be in noncompliance. It is understood and agreed that
         the Accountant's access to Seller's books and records will be limited
         only to those books and records which relate directly to Seller's
         calculation of the Hardship price increase. Such audit shall be
         performed upon not less than ten (10) days prior notice to Seller, and
         will be conducted at such reasonable times agreeable to Seller during
         Seller's normal business hours. Such audit shall be at Buyer's cost and
         expense unless the Accountant determines that Seller's calculation was
         in noncompliance by more than ten percent (10%) of the total Hardship
         price increase, in which event the audit will be at Seller's cost and
         expense.

12.      This Contact constitutes the entire agreement between the parties with
         respect to the subject matter hereof, whether written or oral, and
         there are no understandings, agreements, representations or warranties
         of any kind, express or implied, not expressly set forth herein. No
         modification of or addition to this Contract shall be effective or
         binding on the parties unless made in writing and signed by both
         parties; and no modification or addition shall be affected by the
         acknowledgment or acceptance of purchase order forms containing terms
         or conditions at variance with or in addition to those set forth
         herein.

13.      This Contract shall be binding upon and inure to the benefit of the
         respective successors and assigns of each of the parties hereto, but
         shall not be assigned by Buyer without the prior written consent of
         Seller. Seller's waiver of any breach or failure to enforce any of the
         terms and conditions of this Contract, at any time, shall not in any
         way affect, limit or waive Seller's right thereafter to enforce and
         compel strict compliance with every term and hereof.

14.      In no event shall either party be liable to the other party for any
         incidental, indirect, special, consequential or punitive damages
         whatsoever, on any claim, whether statutory,
<PAGE>

         tort, negligence, strict liability, contract or warranty, implied or
         otherwise, arising out of this Contract, any transaction hereunder or
         the Products supplied hereunder.

15.      Buyer and Seller agree that this Contract shall be governed,
         interpreted and construed in accordance with the laws of the State of
         New York, without regard to conflicts-of-laws rules or principles.
         Unless otherwise stated on the reverse side, the United Nations
         Convention on Contracts for the International Sale of Goods will not,
         for any purpose, govern or apply to this Contract or the performance
         and transactions entered into hereunder.

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