Document:

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                                                                   EXHIBIT 10.20

                            FOURTH AMENDMENT TO LEASE

               THIS FOURTH AMENDMENT TO LEASE (the "Amendment") is made and
entered into as of the 8th day of May, 2002 by and between C.J. SEGERSTROM &
SONS, a California general partnership ("Landlord"), and EMULEX CORPORATION, a
California corporation ("Tenant"), with respect to the following:

                                    RECITALS

               A. Landlord is the landlord and Tenant is the tenant pursuant to
that certain Lease dated June 30, 1999 (the "Original Lease"), as amended by
that certain First Amendment to Lease dated January 21, 2000 (the "First
Amendment"), that certain Second Amendment to Lease dated February 7, 2001 (the
"Second Amendment") and that certain Third Amendment to Lease dated February 21,
2002 (the "Third Amendment"). The Original Lease, First Amendment, Second
Amendment and Third Amendment are herein referred to, collectively, as the
"Lease."

               B. Pursuant to the Lease, Tenant holds and occupies certain
premises consisting of:

                       (1) A certain building commonly known as 3535 Harbor
        Boulevard (the "Original Premises");

                       (2) Suites 103 and 104 of R & D Building No. 6 (the "New
        Premises"); and

                       (3) Suite 124 of R & D Building No. 8 (the "1580
        Premises"),

all of which are located in Harbor Gateway Business Center, Costa Mesa,
California (the "Center"). The Original Premises, New Premises and 1580 Premises
are herein referred to, collectively as the "Current Premises."

               C. Landlord and Tenant desire to enter into this Amendment to add
to the Current Premises upon the terms and conditions set forth herein that
certain premises (the "HT-7 Premises") consisting of 40,020 square feet of
Rentable Area and constituting all of the Rentable Area in that certain building
commonly known as Hi-Tech Building No. 7, located at 3560 Hyland Avenue in the
Center (the "HT-7 Building"). The HT-7 Building is shown cross-hatched on
Exhibit "A" attached hereto.

                                    AGREEMENT

               IN CONSIDERATION OF the foregoing recitals, and the mutual
covenants contained herein, Landlord and Tenant agree as follows:

               1. Leasing of HT-7 Premises . Landlord hereby leases to Tenant,
and Tenant hereby hires from Landlord, the HT-7 Premises upon all of the terms
and conditions of the

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Lease, as hereby amended. Tenant shall hold and occupy the HT-7 Premises as part
of the Current Premises upon all the terms and conditions of the Lease, as
hereby amended, except that:

                      (a) The commencement date of the Lease with respect to the
HT-7 Premises (the "HT-7 Premises Commencement Date") shall be the date upon
which Landlord delivers possession of the HT-7 Premises to Tenant broom clean
and with all mechanical systems therein and roofing in good working order and
repair as of the date of such delivery. Tender of delivery of possession of the
HT-7 Premises shall be deemed to occur upon Landlord's delivery to Tenant of a
fully executed copy of this Amendment. It shall, however, be Tenant's
responsibility to obtain the keys to the HT-7 Premises from Landlord's manager
for the Center. From and after the HT-7 Premises Commencement Date, Tenant shall
lease the HT-7 Premises as part of the Current Premises upon all the terms and
conditions of the Lease, as hereby amended, applicable to the HT-7 Premises and
shall otherwise perform or observe all obligations of the tenant under the
Lease, as hereby amended, with respect to the HT-7 Premises, other than the
payment of all Monthly Basic Rent and Tenant's Proportionate Share of Total
Operating Expenses with respect to the HT-7 Premises as herein provided. From
and after the HT-7 Premises Commencement Date (i) the term of the Lease with
respect to the HT-7 Premises shall be coterminous with the term of the Lease for
the balance of the Current Premises, and (ii) except as otherwise expressly
provided in this Amendment, (A) the term "Premises" as used in the Lease and
this Amendment shall mean and include, respectively, both the Current Premises
(as defined in the Third Amendment) and the HT-7 Premises (as defined in this
Amendment), (B) the terms "Building" and/or "Building A" as used in the Lease
and this Amendment shall mean and include each of Building A (as defined in the
Original Lease), the New Building (as defined in the First Amendment), the 1580
Building (as defined in the Second Amendment), and the HT-7 Building (as defined
in this Amendment).

                      (b) The "HT-7 Premises Rent Commencement Date" shall be
June 1, 2002. From and after the HT-7 Premises Rent Commencement Date Tenant
shall perform and observe all obligations of the tenant under the Lease, as
hereby amended, with respect to the HT-7 Premises, including the payment of all
Monthly Basic Rent and Tenant's Proportionate Share of Total Operating Expenses
with respect to the HT-7 Premises in accordance with the provisions of
paragraphs 3 and 4 below.

                      (c) The provisions of Articles/Sections 11, 32, 41, 48.1,
48.3, 48.7(b), 48.9(g), 48.11, 48.19, 48.22, 48.23 and 48.27 of the Original
Lease shall have no application with respect to the HT-7 Premises or HT-7
Building. In addition, the provisions of the First Amendment (except paragraph 8
and Exhibit A attached thereto) and the Second Amendment shall have no
application to the HT-7 Premises.

                      (d) Those provisions of the Lease superseded or modified
by the provisions of this Amendment shall have no application (if superseded) or
shall apply only as modified (if modified) with respect to the HT-7 Premises.

                      (e) The HT-7 Premises is hereby being leased to Tenant and
added to the "Premises" under the Lease independent from and without regard to
the provisions of paragraph 5 of the Third Amendment. Paragraph 5 of such Third
Amendment shall, however, continue in full force and effect with respect to any
future Available Space (as defined therein).

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               2. Condition of the HT-7 Premises.

                      (a) On the HT-7 Premises Commencement Date, Landlord shall
deliver the HT-7 Premises to Tenant broom clean and with all mechanical systems
therein and roofing in good working order and repair.

                      (b) Within three (3) days after the HT-7 Premises
Commencement Date, Landlord and Tenant shall conduct a joint inspection of the
HT-7 Premises. The purpose of such inspection shall be to establish the
condition of the HT-7 Premises as of the HT-7 Premises Commencement Date.

                      (c) Except as expressly provided in subparagraph (a)
above, Landlord shall deliver the HT-7 Premises to Tenant "AS IS," and Landlord
shall have no responsibility, either as to performance or payment of costs, to
improve the HT-7 Premises for Tenant. Any work of remodeling or improvement of
the HT-7 Premises by Tenant shall be the sole responsibility of Tenant and shall
be in accordance with the applicable provisions of the Lease.

                      (d) Landlord acknowledges that following the HT-7
Commencement Date, Tenant may elect to install new carpeting on and paint the
interior of the second floor of the HT-7 Premises. Any such work shall be
performed in accordance with the applicable provisions of the Lease and the
quality of any carpeting and/or paint shall be equal to or better than
Landlord's building standard grade and the color (and style with respect to any
carpeting) shall each be subject to Landlord's reasonable approval.

               3. Monthly Basic Rent.

                      (a) Monthly Basic Rent for the HT-7 Premises shall be as
follows:

                              (i) For the period from the HT-7 Premises Rent
Commencement Date through and including December 31, 2002, Monthly Basic Rent
for the HT-7 Premises shall be in the sum of $19,009.50 (i.e., $0.475 per square
foot of Rentable Area per month).

                              (ii) For the balance of the term of the Lease with
respect to the HT-7 Premises, the sum of $38,019.00 (i.e., $0.95 per square foot
of Rentable Area per month).

                      (b) All such Monthly Basic Rent for the HT-7 Premises
shall be paid at the times and in the manner provided in Section 3.1 of the
Original Lease.

               4. Additional Rent and Other Charges.

                      (a) From and after the HT-7 Premises Rent Commencement
Date, Tenant shall also pay at the times and in the manner provided in this
subparagraph (a) and Exhibit "B" attached to the First Amendment, Tenant's
Proportionate Share of Total Operating Expenses for the HT-7 Premises in
accordance with the following:

                              (i) Tenant's Proportionate Share of Total
Operating Expenses for the HT-7 Premises shall be one hundred percent (100%).

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                              (ii) For purposes of determining Building
Operating Expenses for the HT-7 Building, the same shall not include real
property taxes for the HT-7 Building. Rather, such taxes shall be paid directly
by Tenant pursuant to the provisions of Article 7 of the Original Lease.

                              (iii) With respect to each full or partial lease
year during the term with respect to the HT-7 Premises, Tenant shall pay an
amount equal to Tenant's Proportionate Share of Landlord's estimate of Total
Operating Expenses for such full year or partial lease year. At the end of each
lease year, an adjustment shall be made by Landlord, and Tenant shall pay such
amount or receive a credit of such amount as is necessary to adjust Tenant's
payments to Tenant's actual Proportionate Share of Total Operating Expenses for
such lease year. Such payments and adjustments shall be made as provided in
Exhibit "B" to the First Amendment. "Total Operating Expenses" and "Tenant's
Proportionate Share" are each defined in Exhibit "B" to the First Amendment.

                      (b) The payment by Tenant of Tenant's Proportionate Share
of Total Operating Expenses for the HT-7 Premises shall be in addition to the
payment of Monthly Basic Rent for the HT-7 Premises.

                      (c) In addition to Monthly Basic Rent and Tenant's
Proportionate Share of Total Operating Expenses for the HT-7 Premises, Tenant
shall also pay all other charges and additional rent provided for in the Lease,
as hereby amended, with respect to the HT-7 Premises and based (to the extent
applicable) upon the Rentable Area thereof.

               5. Utilities. From and after the HT-7 Premises Commencement Date,
Tenant shall pay all charges for all utility services to the HT-7 Premises.

               6. Common Facilities. All references in Paragraph 8 of the First
Amendment to the "New Building" and the "New Current Premises" shall mean and
include the HT-7 Building and the HT-7 Premises.

               7. Parking Spaces for HT-7 Premises. From and after the HT-7
Premises Commencement Date, the following shall apply:

                      (a) Tenant's additional "Allocated Parking Spaces" within
the Parking Areas (as defined in Section 48.26 of the Original Lease) for the
HT-7 Premises is 160 spaces.

                      (b) Except as otherwise provided in the Lease, as hereby
amended, with respect to the Tenant's existing rights to use the Parking Areas
in connection with Tenant's occupancy of Building A, neither Tenant nor its
agents, employees, customers and invitees shall utilize in the aggregate at any
time a number of parking spaces in the Common Facilities in excess of the total
Allocated Parking Spaces for the Premises. In addition to any other remedies
granted to Landlord in the Lease, as hereby amended, or by law, upon default by
Tenant under the terms of this paragraph, Landlord shall have the right to tow
away any vehicles belonging to Tenant or Tenant's agents, employees, customers
or invitees as necessary to reduce the number of parking spaces used by Tenant
and such persons to that number of Allocated Parking Spaces set forth above.

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                      (c) All costs of cleaning, maintaining, operating,
repairing, holding and making available the Parking Area shall be included
within Common Facilities Expenses, as defined in Exhibit "B" to the First
Amendment and a portion thereof shall be included in Tenant's Proportionate
Share as defined in Exhibit "B" to the First Amendment with respect to the HT-7
Premises.

                      (d) Landlord may authorize persons other than tenants of
the Center, their agents, employees, customers and invitees to utilize the
Parking Area; provided, however, that in no event shall the number of spaces
available for Tenant with respect to the HT-7 Premises be less than that number
of Allocated Parking Spaces set forth above. The terms of such usage shall be as
determined by Landlord in its sole discretion and may include the right to use
the Parking Area without charge.

               8. Tenant's Options. From and after the date hereof, the
provisions of Section 48.4 of the Original Lease shall have no further force or
effect.

               9. Brokers. Landlord and Tenant acknowledge that Tenant has been
represented in connection with this Amendment by Julien J. Studley, Inc.
("Tenant's Broker") and Landlord by CB Richard Ellis ("Landlord's Broker"). To
the extent that Tenant's Broker and Landlord's Broker are entitled to any fee or
commission with respect to this Amendment, such fee or commission shall be the
sole responsibility of Landlord. Such commission shall be in an amount to be
established by a separate written agreement(s) between Landlord and Tenant's
Broker and Landlord and Landlord's Broker. Landlord shall indemnify, defend and
hold Tenant harmless from and against all claims by Tenant's Broker and
Landlord's Broker for a fee or commission in connection with this Amendment.

               Except as provided in the immediately preceding paragraph, each
of Landlord and Tenant represents and warrants that it has retained or employed
no broker, finder or agent in connection with this Amendment and that there is
no broker, finder or agent entitled to a fee or commission with respect to this
Amendment under or through the warranting party. Each of Landlord and Tenant
agrees to indemnify, defend and hold the other harmless from and against all
claims resulting from a breach by the indemnifying party of the foregoing
warranty. Payment shall not be a condition precedent to recovery upon any
indemnification provision contained in this paragraph 9. Each such
indemnification provision shall include a covenant by the indemnifying party to
defend the indemnified party against all claims for which indemnification is
available hereunder with legal counsel selected by the liability insurance
carrier for the indemnifying party or otherwise reasonably satisfactory to the
indemnified party.

               10. Lender Approval. Landlord and Tenant acknowledge and agree
that the continued effectiveness of this Amendment is subject to the approval of
this Amendment by Teachers Insurance and Annuity Association, Landlord's lender
with respect to the Center ("Lender"). Promptly upon the last execution and
delivery of this Amendment by Tenant and Landlord, Landlord shall submit this
Amendment to Lender with a request for approval hereof by Lender in writing.
Thereafter, Landlord shall use reasonable efforts to obtain the approval of
Lender to this Amendment as promptly as practicable. Promptly upon receipt of
such approval from Lender, Landlord shall so notify Tenant of the same. In the
event that Landlord is unable to obtain the approval of Lender to this Amendment
within thirty (30) days after Tenant's execution

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and delivery of this Amendment, either party shall have the right to terminate
this Amendment. Such right shall be exercised by either party by written notice
to the other given at any time after the expiration of such thirty (30) day
period and prior to Landlord's notice to Tenant as to such approval. If the
parties are entitled to terminate this Amendment and either party exercises such
right, then (a) this Amendment shall terminate upon the date of receipt of such
notice of termination by the recipient party, (b) each party shall bear its own
costs and fees incurred in the preparation and negotiation of this Amendment,
(c) neither party shall have any further rights or obligations pursuant to this
Amendment and (d) the Lease shall remain in full force and effect without regard
to this Amendment.

               11. Counterparts. This Amendment may be executed in two (2) or
more counterparts, each of which shall be deemed an original but all of which
together shall constitute a single instrument. It shall not be necessary for
Landlord and Tenant to execute the same counterpart(s) of this Amendment for
this Amendment to become effective.

               12. Effective Date. Subject to paragraph 10 above, this Amendment
shall become effective upon the last execution and delivery hereof by Landlord
and Tenant.

               13. Defined Terms. All terms used in this Amendment with initial
capital letters and not defined herein shall have the meanings given to such
terms in the Lease.

               14. Conflicts. In the event of any conflict between the terms of
this Amendment and the terms of the Lease, the terms of this Amendment shall
control.

               15. Lease in Effect. Landlord and Tenant acknowledge and agree
that the Lease, as hereby amended and extended, remains in full force and effect
in accordance with its terms.

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               IT WITNESS WHEREOF, Landlord and Tenant have executed this Fourth
Amendment to Lease to be effective as provided in paragraph 12 above.

EMULEX CORPORATION,                         C.J. SEGERSTROM & SONS, a California
a California corporation                    general partnership

By Sadie A. Herrera                         By   Anton Segerstrom
   ----------------------------------            -------------------------------
                                                 Manager
Title: EVP HR/Facilities
       -----------------
                                            By   HTS Management Co., Inc., a
                                                 California corporation, Manager
By
   ----------------------------------
                                                 By Sally E. Segerstrom
Title:                                              ----------------------------
      -------------------------------
                                                 Title: Sr. Vice President
                 "Tenant"                               -------------------

                                                               "Landlord"

                                       7Prepared by R.R. Donnelley Financial -- Common Stock Purchase Warrant

  
 Exhibit 10.43 
  
 THIS WARRANT AND THE SHARES OF COMMON STOCK ISSUABLE UPON THE EXERCISE HEREOF, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”),
OR FILED OR REGISTERED WITH THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION OR WITH THE SECURITIES REGULATORY AUTHORITY OF ANY STATE, BUT ARE BEING ISSUED PURSUANT TO CERTAIN EXEMPTIONS THEREUNDER. THIS WARRANT, AND SUCH SHARES OF COMMON STOCK,
HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE UNITED STATES SECURITIES AND EXCHANGE COMMISSION OR BY THE SECURITIES REGULATORY AUTHORITY OF ANY STATE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE. THIS WARRANT, AND SUCH SHARES OF COMMON
STOCK, ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE, AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION THEREUNDER OR
EXEMPTION THEREFROM. 
  
 This Warrant Will Be Void After March 22, 2005 
  
 WARRANT 
 TO PURCHASE 1,366,510 SHARES OF COMMON
STOCK OF 
  
 Mobile PET Systems, Inc. 
  
 This is to certify, That FOR VALUE RECEIVED, 
  
 Paul J. Crowe 
 (the “Holder”) 
  
 is entitled to purchase, subject to the provisions of this Warrant, from Mobile PET Systems, Inc. (the “Company”), a Delaware corporation, at any time and from time to time, but not later than March 22, 2005, One
Million Three Hundred and Sixty Six Thousand Five Hundred and Ten (1,366,510 shares of the Company’s common stock, $.0001 par value (“Common Stock”) at a purchase price per share of Fifty Eight Cents ($.58). 
  
 The number of shares of Common Stock to be received upon the exercise of this Warrant and the price to be paid for a share of Common Stock
may be adjusted from time to time as hereinafter set forth. The shares of the Common Stock deliverable upon such exercise, and as adjusted from time to time, are hereinafter sometimes referred to as “Warrant Stock,” and the exercise price
of a share of Common Stock in effect at any time and as adjusted from time to time is hereinafter sometimes referred to as the “Exercise Price.” 
  
 1.    Exercise of Warrant.    This Warrant may be exercised at any time in whole and from time to time in part, but not later than March 22, 2005. If the
date on which the Holder’s right to purchase Common Stock expires is a day on which national banks in San Diego, California, are authorized by law to close, then that right shall expire on the next succeeding day that is not such a day. The
Holder shall exercise all rights to purchase Common Stock by presenting and surrendering this Warrant to the Company or at the office of its stock transfer agent, if any, with the Purchase Form annexed hereto duly executed and accompanied by payment
of the Exercise Price for the number of shares specified in such form. Upon receipt by the Company of this Warrant at the office or agency of the Company, in proper form for exercise, the Holder shall be deemed to be the holder of record of the
shares of Common Stock issuable upon such exercise, notwithstanding that the stock transfer books of the Company shall then be closed or that certificates representing such shares of Common Stock shall not then be actually delivered to the Holder.

 

  
 2.    Reservation of
Shares.    The Company hereby agrees that at all times there shall be reserved for issuance and delivery upon exercise of this Warrant such number of shares of Common Stock as shall be required for issuance or delivery upon
exercise of this Warrant. 
  
 3.    Fractional Shares.    No
fractional shares or script representing fractional shares shall be issued upon the exercise of this Warrant. With respect to any fraction of a share called for upon any exercise hereof, the Company shall pay to the Holder an amount in cash equal to
such fraction multiplied by the current market value of such fractional share, determined as follows: 
  
 (a)  If the Common Stock is listed on a national securities exchange or admitted to unlisted trading privileges on such exchange, the current value shall be the last reported sales price of the Common Stock on such exchange
on the last business day prior to the date of exercise of this Warrant or if no such sale is made on such day, the average of the closing bid and asked prices for such day on such exchange; or 
  

(b)  If the Common Stock is not so listed or admitted to unlisted trading privileges, the current value shall be the mean of the last
reported bid and asked prices reported by the National Association of Securities Dealers Quotation System (“NASDAQ”), or if not so quoted on NASDAQ then by the National Quotation Bureau, Inc., on the last business day prior to the date of
the exercise of this Warrant; or 
  
 (c)  If the Common Stock is not so listed or admitted
to unlisted trading privileges and bid and asked prices are not so reported, the current value shall be an amount, not less than book value, determined in such reasonable manner as may be prescribed by the Company’s board of directors, and
supported by the written fairness opinion of an independent, nationally-recognized stock valuation expert. 
  
 4.    Transfer, Assignment or Loss of Warrant. 
  
 (a)  This Warrant and the Warrant Stock, have not been filed or registered with the United States Securities and Exchange Commission or with the securities regulatory authority of any state. This Warrant and the Warrant
Stock are subject to restrictions imposed by federal and state securities laws and regulations on transferability and resale, and may not be transferred assigned or resold except as permitted under the Securities Act of 1933, as amended (the
“Act”), and the applicable state securities laws, pursuant to registration thereunder or exemption therefrom. Upon receipt by the Company of evidence satisfactory to it that this Warrant has been legally and validly transferred or
assigned, the Company will, at the request of the Holder, upon presentation and surrender hereof to the Company or at the office of its stock transfer agent, if any, exchange this Warrant for a replacement Warrant registered in such name or names as
the Holder shall designate. If, at the time of such transfer or assignment, this Warrant and the Common Stock issuable upon the exercise hereof have not been registered under the Act, then each such transferee and assignee shall furnish the Company
with evidence satisfactory to it that such transferee or assignee is acquiring such Warrant for his, her or its own account, for investment purposes, and not with a view towards a distribution thereof or of the Warrant Stock issuable upon its
exercise. The term “Warrant,” as used herein, includes any Warrants issued in substitution for or replacement of this Warrant. 
  
 (b)  Upon receipt by the Company of evidence satisfactory to it of the loss, theft, destruction or mutilation of this Warrant, and in the case of loss, theft or destruction of reasonably
satisfactory indemnification, and upon surrender and cancellation of this Warrant in the case of mutilation, the Company will execute and deliver a new Warrant of like tenor and date. Any such new Warrant executed and delivered shall constitute an
additional contractual obligation on the part of the Company, whether or not this Warrant so lost, stolen, destroyed or mutilated shall be at any time enforceable by anyone. 
 

 2 

  
 (c)  The Company may cause any legend required under
the Act and applicable state securities laws, or advisable in the opinion of its legal counsel, to be set forth on each Warrant, on each certificate representing Warrant Stock, and on any other security issued or issuable upon exercise of this
Warrant not previously distributed to the public or sold to underwriters for distribution to the public pursuant to 11 hereof. 
  
 5.    Rights of the Holder.    The Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or equity, and the rights of the Holder as
the holder of this Warrant are limited to those expressed in this Warrant. 
  
 6.    Anti-Dilution Provisions.    If the Company shall at any time subdivide the outstanding shares of Common Stock, or shall issue a stock dividend on the outstanding Common Stock,
then the Exercise Price in effect immediately prior to that subdivision or the issuance of that dividend shall be proportionately decreased, and if the Company shall at any time combine the outstanding shares of Common Stock, then the Exercise Price
in effect immediately prior to that combination shall be proportionately decreased, effective at the close of business on the date of the subdivision, dividend or combination, as the case may be. 
  

7.    Officer’s Certificate.    Whenever the Company shall determine the fair market value of the Common Stock
pursuant to Section 3 hereof, the Company shall forthwith file in the custody of its Secretary or an Assistant Secretary at its principal office, and with its stock transfer agent, if any, an officer’s certificate showing the such fair market
value and the date as of which it was determined, and setting forth in reasonable detail the facts requiring such determination and the facts, assumptions, methodology and calculations employed in determining such value. The Company shall forthwith
deliver a copy of each such officer’s certificate to the Holder, and the Company shall make all such officer’s certificates available at all reasonable times for inspection by and copying by the Holder. 
  
 8.    Notices to Holder.    So long as this Warrant shall be outstanding and any portion of
it shall be unexercised, (i) if the Company shall pay any dividend or make any distribution upon the Common Stock or (ii) if the Company shall offer to the holders of Common Stock for subscription or purchase by them any shares of stock of any class
or any other rights or (iii) if any capital reorganization of the Company, reclassification of the Company’s capital stock, consolidation or merger of the Company with or into another corporation, sale, lease or transfer of all or substantially
all of the Company’s property and assets to another corporation, or voluntary or involuntary dissolution, liquidation or winding up of the Company shall be effected, then in any such case, the Company shall cause to be delivered to the Holder,
at least ten days prior to the date specified in (x) or (y) below, as the case may be, a notice containing a brief description of the proposed action and stating the date on which (x) a record is to be taken for the purpose of such dividend,
distribution or rights, or (y) such reclassification, reorganization, consolidation, merger, conveyance, lease, dissolution, liquidation or winding up is to take place and the date, if any is to be fixed, as of which the holders of record of Common
Stock shall be entitled to exchange their shares of Common Stock for securities or other property deliverable upon such reclassification, reorganization, consolidation, merger, conveyance, dissolution, liquidation or winding up. The record date for
any such actions or events shall not be less than ten days after the date on which the Company gives the Holder the notice thereof specified by this 8. 
  
 9.    Reclassification, Reorganization or Merger.    In case of any reclassification, capital reorganization or other change of outstanding shares of
Common Stock of the Company (other than a change in par value, or from par value to no par value, or from no par value to par value, or as a result of an issuance of Common Stock by way of dividend or other distribution or of a subdivision or
combination), or in case of any consolidation or merger of the Company with or into another corporation (other than a merger with a subsidiary in which merger the Company is the continuing corporation and which does not result in any
reclassification, capital reorganization or other change of outstanding shares of Common Stock of the class issuable upon exercise of this Warrant) or in case of any sale or conveyance to another corporation of the property of the Company as an
entirety or substantially as an entirety, the Company shall cause effective provision to be made so that the Holder shall have the right thereafter, by exercising this Warrant, to purchase the kind and amount of shares of stock and other securities
and property receivable 
 

 3 

  
 upon such classification, capital reorganization or other change, consolidation, merger, sale or
conveyance. Any such provision shall include provision for adjustments which shall be as nearly equivalent as may be practicable to the adjustments provided for in this Warrant. The foregoing provisions of this Section 9 similarly apply to
successive reclassifications, capital reorganizations and changes of shares of Common Stock and to successive consolidations, mergers, sales or conveyances. In the event that in any such capital reorganization or reclassification, consolidation,
merger, sale or conveyance, additional shares of Common Stock shall be issued in exchange, conversion, substitution or payment, in whole or in part, for or of a security of the Company other than Common Stock, any such issue shall be treated as an
issue of Common Stock covered by the provisions of Section 6 hereof with the amount of the consideration received upon the issue thereof being determined by the Company’s board of directors, such determination to be final and binding on the
Holder. 
  
 10.    Spin-Offs.    In the event the Company spins-off a
subsidiary by distributing to the Company’s stockholders as a dividend or otherwise the stock of the subsidiary, the Company shall reserve for the life of the Warrant shares of the subsidiary to be delivered to the holders of the Warrants upon
exercise to the same extent as if they were owners of record of the Warrant Stock on the record date for payment of the shares of the subsidiary. 
  
 11.    Registration under the Securities Act of 1933. 
  
 (a)  In the event that the Company proposes at any time when the Warrant is outstanding to file a registration statement under the Act (including for the purpose of this Section 11 a
Notification under Regulation A under the Act and the Offering Circular included therein) relating to Common Stock issued or to be issued by the Company, the Company shall give written notice of such proposal to the Holder and the record owner of
any Warrant Stock. If, within 30 days after the giving of such notice, the Holder or any such record owner shall request in writing that this Warrant or any Warrant Stock be included in such proposed registration, then the Company shall, at its
expense, also register such securities as shall have been so requested in writing; provided, however, that the Holder and such owners shall cooperate with the Company in the preparation of such registration statement to the extent required to
furnish information concerning the Holder and such owners therein. The Company shall be obligated under this Section 11 to register the Warrant and any Warrant Stock one time, and with respect to the first registration statement filed by the Company
that is declared effective. If the Company has not included the Shares in a registration statement filed under the Act by September 22, 2002, then the Company shall, at its expense, file a registration statement with respect to the Shares on that
date. 
  
 (b)  In connection with the filing of a registration statement pursuant to
Section 11(a) hereof, the Company shall: (i) notify the Holder and such owners as to the filing thereof and of all amendments thereto filed prior to the effective date; (ii) notify the Holder and such owners, promptly after it shall have received
notice thereof, of the time when the registration statement becomes effective or any supplement to any prospectus forming a part of the registration statement has been filed; (iii) prepare and file without expense to such owners any necessary
amendment or supplement to such registration statement or prospectus as may be necessary to comply with the Act or advisable in connection with the proposed distribution of the securities; (iv) take all reasonable steps to qualify the Warrant and
the Warrant Stock being registered for sale under the securities or blue sky laws in such reasonable number of states as the Holder and such registered owners may designate in writing and to register or obtain the approval of any federal or state
authority that may be required in connection with the proposed distribution, except, in each case, in jurisdictions in which the Company must either qualify to do business or file a general consent to service of process as a condition to the
qualification of such securities; (v) notify the Holder and such owners of any stop order suspending the effectiveness of the registration statement and use reasonable efforts to remove such stop order; (vi) undertake to keep the registration
statement and prospectus effective for a period of not less than 90 days; and (vii) furnish to the Holder and such owners as soon as available, copies of any such registration statement and each preliminary or final prospectus and any supplement or
amendment required to be prepared pursuant to this 
 

 4 

  
 Section 11. Upon written request, the Company shall also furnish the Holder and
each such owner, without cost, one set of the exhibits to such registration statement. 
  
 (c)  The Company’s obligation under this Section 11 shall be conditioned upon timely receipt by the Company in writing of: (i) information as to the terms of such public offering furnished by or on behalf of the Holder
and each such owner electing to exercise such registration rights; and (ii) such other information as the Company may reasonably require from the Holder and such owners, or any underwriter for any of them, for inclusion in such registration
statement or Notification or post-effective amendment. 
  
 12.    Miscellaneous

  
 (a)  All notices given under this Warrant shall be in writing, addressed to the Company
at 2150 West Washington Street, Suite 110, San Diego, California 92110, and to the Holder at the Holder’s address set forth is the Company’s records, or at such other address as a party may specify by notice given in accordance with this
paragraph, and shall be effective on the earliest of (i) the date received, or (ii) if given by facsimile transmittal with receipt electronically confirmed on the date given if transmitted before 5:00 p.m., the recipient’s time, otherwise it is
effective the next day, or (iii) on the second business day after delivery to a major international air delivery or air courier service (such as Federal Express or Network Couriers). 
  
 (b)  This Warrant is binding on and, except for the limitations on transfer and assignment contained in Section 4, shall inure to the benefit of
the successors in interest of the Company and the Holder, respectively. 
  
 (c)  This
Warrant shall be construed and enforced in accordance with the laws of California. 
  
 (d)  Any controversy or claim arising out of or relating to this Agreement (whether in contract or tort, or both) shall be determined by binding arbitration at San Diego, California, in accordance with the commercial
arbitration rules of the American Arbitration Association, by a panel of three arbitrators, one chosen by each of the parties and the third by the two so chosen. If the two arbitrators cannot agree on a third, then the third shall be appointed in
accordance with such rules. The prevailing party in any arbitration proceeding shall be awarded reasonable attorneys fees and costs of the proceeding. The arbitration award shall be final, and may be entered in and enforced by any court having
jurisdiction. 
  
 Dated and effective as of March 22, 2002. 
  
 
	 MOBILE PET SYSTEMS, INC.
 
	 
	 By
 	 	 /s/    ANTHONY
TURNBULL        
 

	  	 	 Anthony Turnbull, CFO
 

 
 

 5 

  
 PURCHASE FORM 
  
 Date:              
  
 TO:    MOBILE PET SYSTEMS, INC.: 
  
 The undersigned hereby irrevocably elects to
exercise the within Warrant to the extent of purchasing                         
(                ) shares of Common Stock, and hereby makes payment of                 
Dollars and                      Cents ($                ) in payment
of the Exercise Price thereof. 
  
 INSTRUCTIONS FOR REGISTRATION OF STOCK 
  
 Name:                                    
                                        
                                        
                                        
                                        
         
  
 Address:                                    
                                        
                                        
                                        
                                        
     
  
 City, State, Zip
Code:                                       
                                        
                                        
                                        
                 
  
 
	 
	 Signature
 
	 
	                                      
                                       
                                        
                
 
	 
	 Name
 
	 
	                                      
                                        
                                        
              
 
	 
	 Date
signed

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