COMMERCIAL LEASE


1.  PARTIES

    JOHN E. REARDON and PAUL D. REARDON of 981 Providence Highway, Norwood,
    Massachusetts, hereinafter called, LESSORS, which shall include their
    heirs, executors, successors and assigns where context so admits, do hereby
    lease to NOFFOLK SCIENTIFIC INC, d/b/a/ STATSPIN TECHNOLOGIES hereinafter
    called, LESSEE, which expression shall include their successors and assigns
    where the context so admits.

2.  PREMISES

    The LESSORS hereby leases to LESSEE the following described premises:  The
    easterly half of the building (the "Building") at 85 Morse Street, Norwood,
    Massachusetts containing 10,851 square feet.  The LESSEE shall have as
    appurtenant to the Leased Premises the exclusive use of certain parking
    spaces and loading areas and the non-exclusive right to use the driveways
    and any adjacent sidewalks.  See attached Exhibit A and Article 25 for
    description.

3.  TERM

    The term of this lease shall be for five years commencing on April 1, 1990
    and ending on March 31, 1995.  See Paragraph 22 for extensions.

4.  RENT

    The LESSEE shall pay to the LESSORS rent payable in advance in monthly
    installments on the first day of each month according to the following
    schedule of payments:

    April 1, 1990 to March 31, 1991    $62,232.00  per year
                                       $ 5,186.00  per month
    April 1, 1991 to March 31, 1992    $75,804.00  per year
                                       $ 6,317.00  per month
    April 1, 1992 to March 31, 1993    $82,584.00  per year
                                       $ 6,882.00  per month

    The Rent for the period of April 1, 1993 to March 31, 1995 will be
    $82,584.00 per year -  $ 6,882.00 per month plus additional provisions as
    to rent as described in Paragraph 20.  See Paragraph 21 for payment of real
    estate taxes.




5.  UTILITIES

    LESSEE shall pay for all LESSEE'S utility charges which are separately
    metered to the LESSEE.  The charge for the water and sewer use will be
    determined from the water and sewer bill as issued by the Town Norwood on a
    square foot basis for each tenant according to normal Office/ Warehouse
    use.  If LESSORS reasonably determine that LESSEE'S water and sewer use is
    higher than normal use a second water meter will be installed at the
    LESSEE'S expense to record the higher use.  Any additional cost for higher
    than normal use will be paid by the LESSEE.

6.  USE OF LEASED PREMISES

    The LESSEE shall use the Leased Premises only for such purposes as are
    permitted by the municipal zoning ordinances or any other law ordinance or
    requirement applicable to the Leased Premises.  The LESSEE shall have the
    right to store material and/or equipment in the leased premises prior to
    the beginning of the lease term provided such storage does not interfere
    with the construction and alterations for the preparation of the leased
    premises and provided such storage does not conflict with the Building Code
    Law of the Town of Norwood and the Commonwealth of Massachusetts.

7.  COMPLIANCE WITH LAWS

    The LESSEE acknowledges that no trade or occupation shall be conducted in
    the leased premises or use made thereof which will be unlawful, improper,
    noisy or offensive, or contrary to any law or municipal by-law or ordinance
    in force in the Town of Norwood.

8.  FIRE INSURANCE

    The LESSEE shall not permit any use of the leased premises which will make
    voidable any insurance on the property of which the leased premises are a
    part, or on the contents of said property or which shall be contrary to any
    law or regulation from time to time established by the New England Fire
    Insurance Rating Association or any similar body succeeding to its powers.
    The LESSEE shall reimburse the LESSORS, and all other tenants for all extra
    insurance premiums caused by the LESSEE'S use of the premises over normal
    hazards.


9.  MAINTENANCE OF PREMISES

    The LESSEE agrees to maintain the leased premises in the same condition as
    they are at the commencement of the term or as they may be put in during
    the term of this


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    lease, reasonable wear and tear, damage by fire and other casualty only
    excepted, and whenever necessary, to replace plate glass and other glass
    therein, acknowledging that the leased premises will be in good order and
    the glass whole.  The LESSEE shall not permit the leased premises to be
    overloaded, damaged, stripped, or defaced, nor suffer any waste.  The
    LESSEE shall obtain written consent of LESSORS before erecting any sign on
    the premises.  LESSEE agrees to be responsible for all minor repairs, and
    keep the areas of the building appurtenant to the Leased Premises in a neat
    and clean condition.  The plowing of the snow from all access ways and
    parking and loading areas shall be the sole responsibility of the LESSOR.
    The control of snow and ice on all steps, walkways and loading platforms
    which are under the exclusive control of the LESSEE including the spreading
    of sand shall be the sole responsibility of the LESSEE.

10. ALTERATIONS-ADDITIONS

    The LESSEE shall not make structural alterations or additions to the leased
    premises, without the written consent of the LESSORS, which consent shall
    not be unreasonably withheld or delayed.  All such permanent alterations
    shall be at LESSEE'S expense and shall be in quality at least equal to the
    present construction.  LESSEE shall not permit any mechanics' liens, or
    similar liens, to remain upon the leased premises for labor and materials
    furnished to LESSEE in connection with work of any character performed or
    claimed to have been performed at the direction of LESSEE and shall cause
    any such lien to be released of record forthwith without cost to LESSORS.
    Any alterations or improvements made by the LESSEE shall become the
    property of the LESSORS at the termination of occupancy as provided herein.

11. ASSIGNMENT-SUBLEASING

    The LESSEE shall not assign or sublet the whole or any part of the leased
    premises without the written permission of LESSORS which permission shall
    not be unreasonably withheld or delayed.  Such permission will not be
    required for any successors or affiliates of the LESSEE.

12. SUBORDINATION

    This lease shall be subject and subordinate to any and all mortgages, deeds
    of trust and other instruments in the nature of a mortgage, now or at any
    time hereafter, which constitutes a lien an the property of which the
    leased premises are part.  The LESSEE shall, when requested, promptly
    execute and deliver such written


                                         -3-



    instruments as shall be necessary to show the subordination of this lease
    to said mortgages, deed or trust or other such instruments in the nature of
    a mortgage.  The LESSEE'S rights to the quiet enjoyment of the leased
    premises will not be affected by any interaction between the LESSORS and
    their lender.

13. LESSOR'S ACCESS

    The LESSOR'S or agents of the LESSOR may, at reasonable times, enter to
    view the leased premises and may remove placards and signs not approved and
    affixed as herein provided, and make any repairs and alterations as LESSORS
    should elect to do and may show the leased premises to others at any time
    within three (3) months before the expiration of the term and may affix to
    any suitable part of the leased premises a notice for letting or selling
    the leased premises, or property of which the leased premises are a part
    and keep the same so affixed without hindrance or molestation.

14. INDEMNIFICATION AND LIABILITY

    The LESSEE shall save the LESSOR harmless from all losses and damage
    occasioned by the escape of water or by the bursting of pipes resulting
    from LESSEE'S use of the leased premises as well as from any claim or
    damage resulting from neglect in not removing snow and ice from the roof of
    the building or from the sidewalks, paved areas and parking lot upon the
    premises so leased, or by any nuisance made or suffered an the leased
    premises, unless such loss is caused by the neglect of the LESSORS.

    The LESSEE further shall hold harmless the LESSORS from any liability which
    LESSORS may incur as a result of the LESSEE using or discharging any
    chemicals, caustic soda, or other waste or hazardous materials into the
    sewer system or drain system of the premises and any connecting sewer or
    drain lines to said systems.  All permits required for the use or discharge
    of excess water, chemicals, caustic soda or other waste or hazardous
    material into the sewer system or drain system as required by local, state
    or national agencies shall be the responsibility of the LESSEE.  All
    blockages to sewer and drain systems if caused by the neglect or misuse of
    the LESSEE shall be corrected at the expense of the LESSEE.

15. LESSEE'S LIABILITY INSURANCE

    The LESSEE shall maintain with respect to the leased premises and the
    property, of which the leased premises are a part, a comprehensive general
    liability insurance policy, naming the LESSORS as additional named insured


                                         -4-






    with a limit of at least One Million Dollars ($1,000,000.00) combined
    single limit.  The LESSEE shall deposit with the LESSORS certificates far
    such insurance.  No insurance policy shall be cancelled without at least
    ten (10) days prior written notice to the LESSORS.

16. FIRE, CASUALTY-EMINENT DOMAIN

    Should a substantial portion of the leased premises, or of the property of
    which they are a part, be substantially damaged by fire or other casualty,
    or be taken by eminent domain, the LESSEE may elect to terminate this lease
    if:  (a) The LESSOR fails to give written notice within thirty (30) days of
    intention to restore the leased premises, or (b) The LESSOR fails to
    restore the leased premises to a condition substantially suitable for their
    intended use within ninety (90) days of said fire, or taking.  The LESSOR
    will provide a pro rata abatement of rent for any such occurrence or event.
    The LESSOR reserves and the LESSEE grants to the LESSOR, all rights which
    the LESSEE may have for damages or injury to the leased premises for any
    taking by eminent domain, except for damages to the LESSEE'S fixtures,
    property, equipment or business interruption.

17. DEFAULT AND BANKRUPTCY

    In the event that:

    (a)  The LESSEE shall default in the payment of any installment of rent or
    other sum herein specified and such default shall continue for (10) days
    after written notice thereof; or

    (b)  The LESSEE shall default in the observance or performance of any other
    of the LESSEE'S covenants, agreements, or obligations hereunder and such
    default shall not be corrected within thirty (30) days after written notice
    thereof; or

    (c)  The LESSEE shall be declared bankrupt or insolvent according to law,
    or, if any assignment shall be made of LESSEE'S property for the benefit of
    creditors, then the LESSOR shall have the right thereafter, while such
    default continues, to re-enter and take complete possession of the leased
    premises to declare the term of this lease ended, and remove the LESSEE'S
    effects, without prejudice to any remedies which might be otherwise used
    for arrears of rent or other default.  The LESSEE shall indemnify the
    LESSORS against all loss of rent and other payments which the LESSORS may
    incur by reason of such termination during the residue of the term.


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18. NOTICE

    Any notice from the LESSORS to the LESSEE relating to the leased premises
    or the occupancy thereof, shall be deemed duly served, if delivered to an
    officer of the LESSEE addressed to the LESSEE, or, if mailed to the leased
    premises, registered or certified mail, return receipt requested, postage
    prepaid, addressed to the LESSEE.  Any notice from the LESSEE to the
    LESSORS relating to the leased premises or the occupancy thereof, shall be
    deemed duly served, if mailed to the LESSORS by registered or certified
    mail, return receipt requested, postage prepaid, addressed to the LESSORS
    at such address as the LESSORS may from time to time advise in writing.
    All rent and notice shall be paid and sent to the LESSORS, Reardon &
    Reardon, P.0. Box 587, Norwood, Massachusetts 02062.

19. SURRENDER

    The LESSEE shall at the expiration or other termination of this lease
    remove all LESSEE'S goods and effects from the leased premises, (including,
    without hereby limiting the generality of the foregoing, all signs and
    lettering affixed or painted by the LESSEE, either inside or outside the
    leased premises and return all areas where fasteners or hanging devices
    were attached to their original condition.)  LESSEE shall deliver to the
    LESSORS the leased premises and all keys, locks thereto, and other fixtures
    connected therewith and all alterations and additions made to or upon the
    leased premises, in the same condition as they were at the commencement of
    the term, or as they were put in during the term hereof, reasonable wear
    and tear and damage by fire or other casualty only excepted.  In the event
    of the LESSEE'S failure to remove any of the LESSEE'S property from the
    premises, LESSORS are hereby authorized without liability to LESSEE for
    loss or damage thereto, and at the sole risk of the LESSEE, to remove and
    store any of the property at the LESSEE'S expense or to retain same under
    the LESSORS control or to sell at public private sale, without notice any
    or all of the property not so removed and to apply the net proceeds of such
    sale to the payment of any sum due hereafter, or to destroy such property.

20. ADDITIONAL RENT

    The LESSEE shall pay additional rent as follows:

    In each odd numbered year beginning April 1, 1993 in which the Consumer
    Price Index for All Urban Consumers (CPI-U), Boston, MA for the month of
    March 1993 and each succeeding odd year, published by the U.S. Bureau of
    Labor Statistics, shows a rise in the cost of living


                                         -6-



    index from March 1990, ("Index Increase") the LESSEE shall pay to the
    LESSORS as additional rent 100% of the percentage rise in the aforesaid
    index increase times the rent immediately due before such adjustment -
    ($82,584.00 per year as of April 1, 1993).  All such Additional Rent
    payable hereunder shall be due and payable within thirty (30) days after
    the LESSORS shall have given notice to the LESSEE of the level of the Index
    Increase and the amount of the Additional Rent payable.  The LESSEE will
    pay that adjusted rent monthly on the first day of each month.  No
    adjustment shall reduce the rent as previously. payable in accordance with
    this Paragraph or the schedule of payments as shown in Paragraph 4.

21. PAYMENT OF TAXES

    LESSEE will be responsible for the payment of all taxes which are
    separately assessed to the leased premises including but not limited to
    real estate taxes, personal property taxes and sales taxes.  The LESSEE
    also agrees to pay any increase in said taxes previously mentioned.  The
    LESSEE will pay to LESSORS its pro rata share of the real estate taxes due
    an the premises located at 85 Morse Street, Norwood, MA.  LESSEE'S prop
    rata share shall equal Fifty 50 per cent.  LESSEE shall make payments due
    under this Paragraph after receipt from the LESSORS of a statement
    indicating the amount due from the LESSEE, together with a copy of the
    current tax bill, but in - no event shall LESSEE be required to make any
    payment to the LESSORS more than Fifteen (15) days prior to the date the
    applicable installment of the real estate taxes are due to the Town of
    Norwood.

22. OPTION TO EXTEND

    The LESSEE shall have the option to extend this lease as follows:

    If the LESSEE wishes to extend this lease at the end of the Original term
    of this lease, it must no later then Ninety (90) days prior to the
    termination of the original term of this lease, give written notice to
    LESSORS of its intention to extend the lease.  LESSEE shall have the right
    to extend the term of the lease for an additional one five (5) year period
    providing written notice of said extension period is given to LESSORS no
    later than Ninety (90) days prior to the termination of the then current
    term.  The rent for the extended term commencing on April 1, 1995 shall be
    $82,584.00 plus the Additional Rent as provided in Paragraph 4 and
    Paragraph 20.

23. The heating, ventilating and air conditioning equipment will be placed an
    maintenance contract with a qualified


                                         -7-



    firm approved by the LESSORS and at the cost and expense of same to be paid
    by the LESSEE.

24. In the event that there is a change in any laws, regulations, statutes or
    codes as to the use, maintenance or upkeep of the building and real
    property which is subject of this lease, then LESSEE agrees to be
    responsible for One Hundred Percent (100%) of the cost of said compliance
    with said laws, regulations, statutes or codes and shall comply with said
    laws, regulations, statutes or codes within Thirty (30) days of the notice
    of said need for compliance; provided, however, LESSEE shall not be
    required to make or be financially responsible for any structural
    alterations to the leased premises, make any alterations to any mechanical
    systems, to take any actions with regard to the removal or remediation of
    oil, or hazardous materials not caused by or not responsibility of the
    LESSEE or to make any alterations or repairs to any area or item which
    LESSEE is not required to repair or maintain as provided in this lease.  In
    the event the LESSEE does not comply within said Thirty (30) days, then
    LESSORS may take such action which is necessary to make the premises
    conform and the cost of same shall be charged to the LESSEE as additional
    rent to be paid forthwith by the LESSEE.

25. PARKING

    In connection with its use of the leased premises, the LESSEE shall be
    entitled, at no extra charge or fee, the exclusive use of forty (40 )
    parking spaces in the front, side and rear of the building in which the
    leased premises are situated and One (1) Overhead ground level loading area
    as set forth and indicated an the Site Plan attached hereto as Exhibit A.
    In no case shall access to the leased premises, or to the property of which
    the leased premises are a part, be prevented or restricted by the LESSEE.

26. PREPARATION OF THE LEASED PREMISES

    Prior to the commencement of this Lease, the LESSOR shall cause certain
    improvements to be made to the Leased Premises and to the property of which
    they are a part, all as set forth on the Scheduled attached hereto as
    Exhibit B.  The leased premises shall be deemed ready for occupancy on the
    first day (the "Substantial Completion Date") as of which the improvements
    listed on Exhibit 13 have been completed and are adequate for their
    intended purposes.  The LESSORS will obtain a Certificate of Occupancy for
    the leased premises from the Town of Norwood and will complete all items of
    work as soon as conditions permit and with all due diligence.


                                         -8-



27. SIGNS

    The LESSEE shall obtain written consent of LESSORS before erecting any sign
    on the premises which consent shall not be unreasonably withheld.  Each
    tenant shall have a user identification sign over the main entrance not
    exceeding 4'-0" long by 2'-0" high which may be illuminated at tenant's
    option plus one similar sign on Pleasant Street elevation plus sign not
    exceeding 2'-0" long by 1'0" high over shipping and receiving door.  All
    signs must conform to the Signage By-Laws of the Town of Norwood.

28. FIRE ALARM

    The LESSORS agree to maintain the fire alarm pull box presently mounted an
    the outside of the building in good working order.


IN WITNESS WHEREOF, the LESSORS and the LESSEE have caused this Lease to be duly
executed, under seal, and by persons hereunto duly authorized, in multiple
copies, each to be considered an original hereof, this 15th day of February
1990.


                        LESSORS:  REARDON & REARDON


                        By:  s/s John E. Reardon
                             -------------------------------
                             John E. Reardon - Partner



                        By:  s/s Paul D. Reardon
                             -------------------------------
                             Paul D. Reardon - Partner


                        LESSEE: NORFOLK SCIENTIFIC, INC.
                                d/b/a/ STATSPIN TECHNOLOGIES


                        By:  /s/ T.F. Kelley
                             -------------------------------


                                         -9-



                                  TABLE OF CONTENTS
                                  -----------------

                                                                   PAGE
                                                                   ----
              1.   PARTIES . . . . . . . . . . . . . . . . . . .     1

              2.   PREMISES. . . . . . . . . . . . . . . . . . .     1

              3.   TERM. . . . . . . . . . . . . . . . . . . . .     1

              4.   RENT. . . . . . . . . . . . . . . . . . . . .     1

              5.   UTILITIES . . . . . . . . . . . . . . . . . .     2

              6.   USE OF LEASED PREMISES. . . . . . . . . . . .     2

              7.   COMPLIANCE WITH LAWS. . . . . . . . . . . . .     2

              8.   FIRE INSURANCE. . . . . . . . . . . . . . . .     2

              9.   MAINTENANCE OF PREMISES . . . . . . . . . . .     2

              10.  ALTERATIONS-ADDITIONS . . . . . . . . . . . .     3

              11.  ASSIGNMENT-SUBLEASING . . . . . . . . . . . .     3

              12.  SUBORDINATION . . . . . . . . . . . . . . . .     3

              13.  LESSOR'S ACCESS . . . . . . . . . . . . . . .     4

              14.  INDEMNIFICATION AND LIABILITY . . . . . . . .     4

              15.  LESSEE'S LIABILITY INSURANCE. . . . . . . . .     4

              16.  FIRE, CASUALTY-EMINENT DOMAIN . . . . . . . .     5

              17.  DEFAULT AND BANKRUPTCY. . . . . . . . . . . .     5

              18.  NOTICE. . . . . . . . . . . . . . . . . . . .     6

              19.  SURRENDER . . . . . . . . . . . . . . . . . .     6

              20.  ADDITIONAL RENT . . . . . . . . . . . . . . .     6

              21.  PAYMENT OF TAXES. . . . . . . . . . . . . . .     7

              22.  OPTION TO EXTEND. . . . . . . . . . . . . . .     7

              25.  PARKING . . . . . . . . . . . . . . . . . . .     8


                                         -i-



              26.  PREPARATION OF THE LEASED PREMISES. . . . . .     8

              27.  SIGNS . . . . . . . . . . . . . . . . . . . .     9

              28.  FIRE ALARM. . . . . . . . . . . . . . . . . .     9


                                         -ii-



                        FIRST AMENDMENT TO AGREEMENT OF LEASE


THIS FIRST AMENDMENT TO LEASE is made as of this first day of April, 1995 by and
between JOHN E. REARDON and PAUL D. REARDON ("Lessors"), and NORFOLK SCIENTIFIC
INC, d/b/a STATSPIN TECHNOLOGIES ("Lessee").

WHEREAS, Lessors and Lessee entered into an Agreement of Lease dated
February 15, 1990 ("Lease").

WHEREAS, Lessors and Lessee desire to extend the Lease for the easterly half of
the building at 85 Morse Street, Norwood, Massachusetts containing 10,851 square
feet ("Premises").

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency
of which is hereby acknowledged, Lessor and Lessee hereby agree to amend the
Lease as follows:

1.   Extension Term

     The term of this Lease shall be extended for a period of five (5) years
     commencing on April 1, 1995 and terminating on March 31, 2000 ("Extension
     Term").

2.   Rent

     The LESSEE shall pay to the LESSORS rent payable on advance in monthly
     installments of the first day of each month according to the following
     schedule of payments:

     April 1, 1995 to March 31, 1996 - $7,161.00/month.
     April 1, 1996 to March 31, 1997 - $7.161.00/month.
     April 1, 1997 to March 31, 1998 - $7,161.00/month.

     The rent for the period of April 1, 1998 to March 31, 2000 shall be
     $7,161.00 per month plus 100% of the rise in the Consumer Price Index for
     all Urban Consumers (CPI-U) from April 1, 1995 to March 31, 1998.

3.   Lessor and Lessee represent and warrant to each other that they have the
     full right, power, and authority to enter into this First Agreement to
     lease without the consent or approval of any other entity or person and
     make these representations knowing that the other party will rely thereon.
     The signatory on behalf of Lessor and Lessee further represent and warrant
     that they have full right, power and authority to act for and on behalf of
     Lessor and Lessee in entering into this First Amendment.

4.   The provisions of this First Amendment to Lease shall constitute the entire
     agreement between the parties relating to the First Amendment to Lease
     superseding all prior oral and written communications, quotations,




     agreements or understandings of the parties with respect to the subject
     matter of the First Amendment.

5.   Except as herein modified, the terms and conditions of the Lease, which by
     this reference are incorporated herein, shall remain in full force and
     effect with regard to the premises.

6.   The Lessee shall notify in writing no later than December 31, 1999 if an
     additional renewal term beyond March 31, 2000 is desired or if Lessee
     intends to vacate the premises on March 31, 2000.

IN WITNESS WHEREOF, Lessors and Lessee have caused this First Amendment to
Agreement of Lease to be duly executed by persons hereunto duly authorized, in
multiple copies, each to be considered an original hereof, this first day of
April 1995.

                         LESSORS:  JOHN E. REARDON
                                   PAUL D. REARDON


                         By:  /s/ John E. Reardon
                              ------------------------------
                              John E. Reardon  -  Partner


                         By:  
                              ------------------------------
                              Paul D. Reardon  -  Partner


                         LESSEE:   NORFOLK SCIENTIFIC, INC.
                                   d/b/a/STATSPIN TECHNOLOGIES


                         By:  T.F. Kelley - 3/22/95
                              ------------------------------
                              Thomas F. Kelley  -  President


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