BIO RAD LABORATORIES INC
SC 13D, 2000-01-13
LABORATORY ANALYTICAL INSTRUMENTS
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                             (Amendment No. ____)*



                          Bio-Rad Laboratories, Inc.
________________________________________________________________________________
                               (Name of Issuer)


                 Class B Common Stock, Par Value $1 per share
________________________________________________________________________________
                         (Title of Class of Securities)


                                  090572-21-8
        _______________________________________________________________
                                (CUSIP Number)

  David Schwartz, 1000 Alfred Nobel Drive, Hercules, CA 94547 (510) 724-7000
________________________________________________________________________________
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                Communications)

                               December 13, 1999
        _______________________________________________________________
            (Date of Event which Required Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Check the following box if a fee is being paid with the statement [X]. (A fee is
not required only if the reporting person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)

Note:  Six copies of this statement, including all exhibits, should be filed
with the Commission.  See Rule 13d-1(a) for other parties to whom copies are to
be sent.

* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                              Page 1 of [ ] Pages
<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
  CUSIP NO. 090572-21-8                                    PAGE 2 OF    PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      David Schwartz, ###-##-####
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                              (a) [x]
      Alice N. Schwartz, as spouse of David Schwartz, has a     (b) [_]
      one-half community property interest in 2,166,958 shares
      of this class.
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
      PF
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
 5         TO                                                         [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      United States Citizen
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            22,013

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          2,030,027
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             22,013

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          2,030,027
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      2,180,683

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
                                                                             [X]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      87.8%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

<PAGE>

                                 SCHEDULE 13D
- -----------------------                                  ---------------------
 CUSIP NO. 090572-21-8                                     PAGE 3 OF   PAGES
- -----------------------                                  ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Norman D. Schwartz, ###-##-####
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [X]
                                                                (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS*
 4
      PF,OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEMS 2(d) or 2(e) [_]
 5
- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      United States Citizen
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     7
     NUMBER OF            -0-

      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      8
                          2,030,027
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     9
    REPORTING             -0-

      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          10
                          2,030,027
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      2,032,841

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [X]
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
13
      81.8%
- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN
- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>

                                 SCHEDULE 13D
- ------------------------                                 ---------------------
  CUSIP NO.  090572-21-8                                   PAGE 4 OF    PAGES
- ------------------------                                 ---------------------

- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Steven D. Schwartz, ###-##-####
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 2                                                                     (a) [x]
                                                                       (b) [_]
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3

- ------------------------------------------------------------------------------
      SOURCE OF FUNDS
 4
      PF,OO
- ------------------------------------------------------------------------------
      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
 5                                                                         [_]

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 6
      United States Citizen
- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
     NUMBER OF       7
      SHARES              -0-

- ------------------------------------------------------------------------------
   BENEFICIALLY           SHARED VOTING POWER
     OWNED BY        8
       EACH               2,030,027

- ------------------------------------------------------------------------------
    REPORTING             SOLE DISPOSITIVE POWER
     PERSON          9
      WITH                -0-

- ------------------------------------------------------------------------------
                          SHARED DISPOSITIVE POWER
                    10
                          2,030,027
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
11
      2,030,027

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
12
      [X]

- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) EXCLUDES CERTAIN
      SHARES*
13
      81.7%

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
14
      IN

- ------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>

                                 SCHEDULE 13D
- -----------------------                                      -------------------
CUSIP NO.  090572-21-8                                       PAGE 5 OF    PAGES
- -----------------------                                      -------------------

- --------------------------------------------------------------------------------
         NAME OF REPORTING PERSON
   1     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

         Blue Raven Partners, L.P., 943334150

- -------------------------------------------------------------------------------
         CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a) [x]
   2                                                                  (b) [_]


- -------------------------------------------------------------------------------
         SEC USE ONLY
   3


- -------------------------------------------------------------------------------
         SOURCE OF FUNDS
   4
         PF

- -------------------------------------------------------------------------------
         CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
   5     [_]

- -------------------------------------------------------------------------------
         CITIZENSHIP OR PLACE OF ORGANIZATION
   6
         California
- --------------------------------------------------------------------------------
                                   SOLE VOTING POWER
        NUMBER OF             7
          SHARES                   2,030,027

- --------------------------------------------------------------------------------
       BENEFICIALLY                SHARED VOTING POWER
         OWNED BY             8
           EACH                    -0-

- --------------------------------------------------------------------------------
        REPORTING                  SOLE DISPOSITIVE POWER
          PERSON              9
           WITH                    2,030,027
- --------------------------------------------------------------------------------
                                   SHARED DISPOSITIVE POWER
                             10
                                   -0-
- --------------------------------------------------------------------------------
          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   11
          2,030,027

- --------------------------------------------------------------------------------
          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
   12     [_]

- --------------------------------------------------------------------------------
          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) EXCLUDES CERTAIN
   13     SHARES*

          81.7%

- --------------------------------------------------------------------------------
          TYPE OF REPORTING PERSON*
   14
          PN

- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.
<PAGE>

Item 1.  Security and Issuer
- ----------------------------

         This statement relates to the Class B Common Stock, par value $1.00 per
share ("Class B Common Stock"), of Bio-Rad Laboratories, Inc. ("Bio-Rad" or the
"Company") whose principal offices are located at 1000 Alfred Nobel Drive,
Hercules, California 94547.

Item 2.  Identity and Background
- --------------------------------

         Reference is made to Amendment Number 6 to the statement on Schedule
13D filed on February 28, 1997, and revised on May 20, 1997 by David Schwartz
and Alice N. Schwartz, the statement on Schedule 13D filed on January 7, 1994 by
Norman D. Schwartz and the statement on Schedule 13D filed on January 14, 1994
by Steven D. Schwartz (collectively, the '`Prior Filings). Each of David
Schwartz, Alice N. Schwartz, Norman D. Schwartz and Steven D. Schwartz together
with Blue Raven Partners, L.P. (sometimes collectively referred to as the
"Shareholders") have agreed to file this statement jointly in an agreement
entered into pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of
1934, as amended, and attached as an exhibit to this statement, which agreement
is hereby incorporated by reference. The Prior Filings are incorporated herein
by reference and are hereby amended by this statement which is filed by the
Shareholders, with respect to whom the following information relates:

         (i)  David Schwartz, President and Chairman of the Board of Bio-Rad,
              1000 Alfred Nobel Drive, Hercules, California 94547.

              Alice N. Schwartz, a Director of Bio-Rad, has one-half community
              property interest in all share owned beneficially by David
              Schwartz. Alice N. Schwartz is retired and resides at 1129 James
              Place, El Cerrito, California 94530.

              During the last five years, neither David Schwartz nor Alice N.
              Schwartz has been convicted in a criminal proceeding (excluding
              traffic violations and similar misdemeanors) nor has been a party
              to civil proceedings of a judicial or administrative body of
              competent jurisdiction and as a result of such proceedings was or
              is subject to a judgment, decree or final order enjoining future
              violations of, or prohibiting or mandating activities subject to,
              Federal or State securities laws or finding any violation with
              respect to such laws.

              David Schwartz and Alice N. Schwartz are citizens of the United
              States of America.

         (ii) Norman D. Schwartz, Vice President and Director of Bio-Rad, 1000
              Alfred Nobel Drive, Hercules, California 94547.

                              Page 6 of [ ] Pages
<PAGE>

                During the last five years, Norman D. Schwartz has not been
                convicted in a criminal proceeding (excluding traffic violations
                and similar misdemeanors) nor has been a party to civil
                proceedings of a judicial or administrative body of competent
                jurisdiction and as a result of such proceedings was or is
                subject to a judgment, decree or final order enjoining future
                violations of, or prohibiting or mandating activities subject
                to, Federal or State securities laws or finding any violation
                with respect to such laws.

                Norman D. Schwartz is a citizen of the United States of America.

         (iii)  Steven D. Schwartz, an employee of Bio-Rad, 1000 Alfred Nobel
                Drive, Hercules, California 94547.

                During the last five years, Steven D. Schwartz has not been
                convicted in a criminal proceeding (excluding traffic violations
                and similar misdemeanors) nor has been a party to civil
                proceedings of a judicial or administrative body of competent
                jurisdiction and as a result of such proceedings was or is
                subject to a judgment, decree or final order enjoining future
                violations of, or prohibiting or mandating activities subject
                to, Federal or State securities laws or finding any violation
                with respect to such laws.

                Steven D. Schwartz is a citizen of the United States of America.

         (iv)   Blue Raven Partners, L.P. (the "Partnership"), is a California
                limited partnership organized to provide consolidated management
                of certain assets owned by the partners with its principal place
                of business at 1129 James Place, El Cerrito, California 94530.

                During the last five years, the Partnership has not been
                convicted in a criminal proceeding (excluding traffic violations
                and similar misdemeanors) nor has been a party to civil
                proceedings of a judicial or administrative body of competent
                jurisdiction and as a result of such proceedings was or is
                subject to a judgment, decree or final order enjoining future
                violations of, or prohibiting or mandating activities subject
                to, Federal or State securities laws or finding any violating
                with respect to such laws.

Item 3.  Source and Amount of Funds or Other Consideration
- ----------------------------------------------------------

         The Class B Common Stock held by the Partnership were contributed by
its partners in exchange for units in the Partnership.

         The Class B Common Stock contributed to the Partnership by David
Schwartz and Alice N. Schwartz were acquired with personal funds.

         The Class B Common Stock contributed to the Partnership by Norman D.
Schwartz and Steven D. Schwartz were acquired by them with personal funds, by
gift and through the laws of descent and distribution.

                              Page 7 of [ ] Pages
<PAGE>

Item 4.  Purpose of Transaction
- -------------------------------

         The purpose of the acquisition of the Class B Common Stock by the
Partnership is to provide consolidated management of certain assets owned by the
partners.

Item 5.  Interest in Securities of the Issuer
- ---------------------------------------------

         (a)-(b):

         The Partnership:

         The Partnership is the direct and beneficial owner of 2,030,027 shares
         of the Class B Common Stock with respect to which it has sole voting
         and dispositive power, representing 81.7% of the issued and outstanding
         Class B Common Stock.

         David Schwartz and Alice N. Schwartz, Norman D. Schwartz and Steven D.
         Schwartz:

         David Schwartz and Alice N. Schwartz, Norman D. Schwartz and Steven D.
         Schwartz have indirect beneficial ownership of the 2,030,027 shares of
         Class B Common Stock held by the Partnership, over which they have
         shared voting and dispositive power, as the result of their positions
         as general partners in the Partnership.

         David Schwartz and Alice N. Schwartz are general partners in DANSA
         Partners Limited, a California limited partnership ("DANSA Partners")
         which, from time to time, holds securities of the issuer. As general
         partners of the DANSA Partners, David Schwartz and Alice N. Schwartz
         have voting and dispositive power of the Limited Partnership's shares.
         Currently, DANSA Partners holds 20,588 shares of Class B Common Stock.
         David Schwartz and Alice N. Schwartz are the beneficial owners of 1,425
         shares of Class B Common Stock over which they have sole voting power.
         David Schwartz has options to purchase 185,625 shares of Class B Common
         Stock, of which 128,643 are exercisable whithin sixty days, and which
         constitutes community property. As the result of the foregoing, David
         Schwartz and Alice N. Schwartz have beneficial ownership of an
         aggregate of 2,180,683 shares of Class B Common Stock, representing
         87.8% of the issued and outstanding Class B Common Stock.

         Norman D. Schwartz is a limited partner in DANSA Partners and has no
         voting or dispositive power over and disclaims beneficial ownership of
         the shares of Class B Common Stock held by DANSA Partners. Norman D.
         Schwartz has options to purchase 7,500 shares of Class B Common Stock,
         of which 2,814 are exercisable within sixty days. Norman D. Schwartz
         disclaims beneficial ownership with respect to 2,600 shares of Class B
         Common Stock owned directly and beneficially by Norman D. Schwartz's
         wife. As the result of the foregoing, Norman D. Schwartz has
         beneficial ownership of an aggregate of 2,032,841 shares of Class B
         Common Stock, representing 81.8% of the issued and outstanding Class B
         Common Stock.

                              Page 8 of [ ] Pages
<PAGE>

         Steven D. Schwartz is a limited partner in DANSA Partners and has no
         voting or dispositive power over and disclaims beneficial ownership of
         the shares of Class B Common Stock held by DANSA Partners. Steven D.
         Schwartz disclaims beneficial ownership with respect to 2,600 shares of
         Class B Common Stock owned directly and beneficially by Steven D.
         Schwartz's wife. As the result of the foregoing, Steven D. Schwartz has
         beneficial ownership of an aggregate of 2,030, 027 shares of Class B
         Common Stock, representing 81.7% of the issued and outstanding Class B
         Common Stock.

         (c):

         On December 13, 1999, David Schwartz and Alice N. Schwartz, caused a
         revocable trust (the "Schwartz Revocable Trust") for which they are
         trustees, to contribute to the Partnership 1,674,101 shares of Class B
         Common Stock in exchange for the Schwartz Revocable Trust receiving
         general partnership units and limited partnership units of the
         Partnership.

         On December 13, 1999, Norman D. Schwartz contributed to the Partnership
         147,811 shares of Class B Common Stock held directly by Norman D.
         Schwartz in exchange for general partnership units and limited
         partnership units in the Partnership. As a custodian, Norman D.
         Schwartz also contributed 31,727 shares of Class B Common Stock for
         each of Allison C. Schwartz CUTMA and Julia S. Schwartz CUTMA, in
         exchange for limited partnership units in the Partnership being issued
         to Allison C. Schwartz and Julia S. Schwartz.

         On December 13, 1999, Steven D. Schwartz contributed to the Partnership
         144,661 shares of Class B Common Stock held directly by Steven D.
         Schwartz in exchange for general partnership units and limited
         partnership units in the Partnership.

Item 6.  Contracts, Arrangements, Understandings or Relationships with respect
- ------------------------------------------------------------------------------
to Securities of the Issuer
- ---------------------------

         David Schwartz owns beneficially 1,607,124 shares of the Class A
Common Stock, par value $1.00 per share ("Class A Common Stock") of the Company,
representing 16.7% of the issued and outstanding Class A Common Stock.

         Norman D. Schwartz is the direct and beneficial owner of 100,477
shares of Class A Common Stock, and has options to acquire 11,250 shares of
Class A Common Stock, of which 10,313 are exercisable within sixty days.  As
the result of the foregoing, Norman D. Schwartz has beneficial ownership of
110,790 shares of Class A Common Stock, representing 1.2% of the issued and
outstanding Class A Common Stock.

         Steven D. Schwartz is the direct and beneficial owner of 81,174 shares
of Class A Common Stock, representing 0.8% of the issued and outstanding Class A
Common Stock.

                              Page 9 of [ ] Pages
<PAGE>

         David Schwartz and Alice N. Schwartz are married and are the parents of
Norman D.Schwartz, and Steven D. Schwartz. By virtue of the Shareholders' Class
B Common Stock ownership they control the management of the Company and may be
deemed to be "control persons" of the Company as that term is defined in the
Rules and Regulations of the Securities and Exchange Commission.

Item 7.  Material To Be Filed as Exhibits
- -----------------------------------------

         Exhibit 1  -  Agreement Among the Shareholders to File Joint Schedule
                       13D.

         Exhibit 2  -  Limited Partnership Agreement of Blue Raven Partners L.P.

                             Page 10 of [ ] Pages
<PAGE>

Signature

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.


                                        /s/ David Schwartz
                                        ------------------------
January 11, 2000                        David Schwartz, individually


                                        /s/ Alice N.  Schwartz
                                        ------------------------
January 11, 2000                        Alice N. Schwartz, individually



                                        /s/ Norman D. Schwartz
                                        ------------------------
January 11, 2000                        Norman D. Schwartz, individually


                                        /s/ Steven D. Schwartz
                                        ------------------------
January 11, 2000                        Steven D. Schwartz, individually


                                        BLUE RAVEN PARTNERS L.P.


                                        /s/ David Schwartz
                                        ------------------------
January 11, 2000                        David Schwartz
                                        General Partner

                             Page 11 of [ ] Pages

<PAGE>

                                   EXHIBIT 1



     Pursuant to Rule 13D-1(k)(1) under the Securities Exchange Act of 1934, as
amended, the undersigned hereby agree only one statement containing information
required by Schedule 13D need be filed with respect to the ownership by each of
the undersigned of shares of Class B Common Stock of Bio-Rad Laboratories, Inc.

Dated:  January 11, 2000

                              /s/ David Schwartz
                              ------------------
January 11, 2000              David Schwartz, individually


                              /s/ Alice N. Schwartz
                              --------------------------------
January 11, 2000              Alice N. Schwartz, individually


                              /s/ Norman D. Schwartz
                              ----------------------
January 11, 2000              Norman D. Schwartz, individually


                              /s/ Steven D. Schwartz
                              ----------------------
January 11, 2000              Steven D. Schwartz, individually


                              BLUE RAVEN PARTNERS L.P.


                              /s/ David Schwartz
                              ------------------
January 11, 2000              David Schwartz
                              General Partner



                            Page 12  of  [ ]  Pages



<PAGE>

                                   EXHIBIT 2

                         LIMITED PARTNERSHIP AGREEMENT


                                       of

                           BLUE RAVEN PARTNERS, L.P.,

                        A CALIFORNIA LIMITED PARTNERSHIP



THE SECURITIES REPRESENTED BY THIS AGREEMENT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, NOR REGISTERED OR QUALIFIED UNDER ANY STATE SECURITIES
LAWS. SUCH SECURITIES MAY NOT BE OFFERED FOR SALE, SOLD, DELIVERED AFTER SALE,
TRANSFERRED, PLEDGED, OR HYPOTHECATED UNLESS QUALIFIED AND REGISTERED UNDER
APPLICABLE FEDERAL AND STATE SECURITIES LAWS, OR UNLESS IN THE OPINION OF
COUNSEL SATISFACTORY TO THE COMPANY SUCH QUALIFICATION AND REGISTRATION IS NOT
REQUIRED. ANY TRANSFER OF THE SECURITIES REPRESENTED BY THIS AGREEMENT IS
FURTHER SUBJECT TO OTHER RESTRICTIONS, TERMS AND CONDITIONS WHICH ARE SET FORTH
HEREIN.
<PAGE>

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

<TABLE>
<CAPTION>
                                                                                               Page No.
                                                                                               --------
<S>                                                                                            <C>
1.   Formation; Name; Principal Place of Business............................................         1

2.   Term....................................................................................         1

3.   Purposes................................................................................         2
     3.1  General Purposes...................................................................         2
     3.2  Specific Initial Purposes..........................................................         2
     3.3  General Partners' Authority to Fulfill Purposes....................................         3

4.   Partners................................................................................         3
     4.1  General Partners...................................................................         3
     4.2  Limited Partners...................................................................         4

5.   Capital Contributions...................................................................         4
     5.1  No Withdrawals.....................................................................         4
     5.2  Additional Capital Contributions...................................................         4

6.   Partner's Capital Accounts..............................................................         5

7.   Net Income (Profits), Net Losses and Distributions......................................         6
     7.1  Accounting for Net Income (Profits) or Net Losses..................................         6
     7.2  Allocation of Net Income (Profits) or Net Losses and Income Tax
          Credits............................................................................         6
     7.3  Distributions......................................................................         7
     7.4  Section 704(c) - Special Rule for Contributed Property.............................         8
     7.5  Corrective Amendments for Tax Purposes.............................................         8

8.   Liabilities.............................................................................         9
     8.1  Limited Liability of a Limited Partner.............................................         9
     8.2  Indemnification....................................................................         9

9.   Management..............................................................................        10
     9.1  General Partners as Manager........................................................        10
     9.2  Limitations on General Partners....................................................        12
     9.3  Obligation of the General Partners to Provide Time and Skill to Partnership........        13
     9.4  Limited Partner Has No Management Rights...........................................        13
     9.5  Bank Deposits......................................................................        13
     9.6  Reports, Books and Records.........................................................        13
     9.7  Agent for Service of Process.......................................................        15

10.  Transfer of Partnership Interests.......................................................        16
     10.1  By Limited Partner................................................................        16
     10.2  Transfers in Violation of Section 10.1............................................        17
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                                <C>
     10.3  By General Partner................................................................      18
     10.4  Purchase of Units in the Event of Bankruptcy, Insolvency,
           Divorce or Other Prohibited Transfer..............................................      18
     10.5  Substituted Partners..............................................................      21
     10.6  Investment Representation of Limited Partner......................................      21

11.  Termination.............................................................................      21
     11.1  Terminating Events................................................................      21
     11.2  Election to Continue..............................................................      22
     11.3  Dissolution.......................................................................      23
     11.4  Bankruptcy........................................................................      24

12.  Power of Attorney.......................................................................      25
     12.1  General Partner Appointed as Attorneys-In-Fact....................................      25
     12.2  Power Coupled With An Interest....................................................      25
     12.3  Substituted Limited Partner.......................................................      26

13.  Death, Incompetency or Dissolution of a Limited Partner.................................      26

14.  Election Under Section 754 of the Code; Waiver of Right of Partition....................      26
     14.1  Election Under Section 754 of the Code............................................      26
     14.2  Waiver of Right of Partition......................................................      27

15.  Miscellaneous...........................................................................      27
     15.1  Notices...........................................................................      27
     15.2  Pronouns..........................................................................      27
     15.3  Capacity..........................................................................      27
     15.4  Binding Effect....................................................................      28
     15.5  Agreement in Counterparts.........................................................      28
     15.6  Amendment of Agreement............................................................      28
     15.7  Governing Law; Consent to Binding Arbitration, Jurisdiction and Venue.............      28
     15.8  Attorneys' Fees...................................................................      29
</TABLE>

                                      ii
<PAGE>

                         LIMITED PARTNERSHIP AGREEMENT
                         -----------------------------

     This Limited Partnership Agreement is made this ____ day of __________,
1999, and is intended to be effective as of December 31, 1998 (the "Effective
Date"), by and between David Schwartz, Alice Schwartz, Norman Schwartz and
Steven Schwartz, as general partners (the "General Partners"), and those parties
listed on Exhibit A, as limited partners (whenever used in this Agreement the
          ---------
term "Limited Partner", or, collectively, "Limited Partners," shall refer to the
Limited Partners indicated above and any successors or assigns thereto). The
General Partners and the Limited Partners are collectively referred to as the
"Partners".

     In consideration of the mutual covenants herein contained, the Partners
agree as follows:

1.   Formation; Name; Principal Place of Business.
     --------------------------------------------

     The Partners hereby form with each other a limited partnership (the
"Partnership"), pursuant to the provisions of the California Revised Limited
Partnership Act (California Corporations Code Sections 15611-15723).  The name
of the Partnership shall be Blue Raven Partners, L.P., a California Limited
Partnership, and its principal place of business shall initially be at 1129
James Place, El Cerrito, California or at such other place as the General
Partners may from time to time hereafter designate.

2.   Term.
     ----

     The Partnership shall commence upon the General Partners' filing a
Certificate of Limited Partnership (the "Certificate") with the California
Secretary of State pursuant to Section 15621 of the California Corporations
Code.  The Partnership shall continue until December 31, 2049, unless sooner
terminated pursuant to the provisions of this Agreement.

                                       1
<PAGE>

3.   Purposes.
     --------

     3.1  General Purposes.
          ----------------

          The Partnership is being formed for the primary and general purposes
of (i) providing consolidated management for certain assets owned by the
Partners which are currently held by several individuals, or may be divided in
the future by gift or testamentary disposition, and (ii) providing  for the
efficient and skilled management of such assets in the future, and (iii)
protecting such assets from the creditors of individual Partners, from transfer
as a result of a failed marriage, from dilution by sale of partial interests in
such assets, and from transfers to parties who are not "Permitted Transferees"
(defined below), and (iv) providing a concentrated financial position to take
advantage of economies of scale, facilitate the use of investment advisors
requiring minimum investments and diversify family holdings; and (v) to promote
family harmony by providing for an orderly buy-sell arrangement among Permitted
Transferees, for private arbitration of any disputes, and for orderly succession
of management and control of family assets.

     3.2  Specific Initial Purposes.
          -------------------------

          The specific purposes of the Partnership shall be to aggregate a
significant amount of Class B stock (the "Stock") in Bio-Rad Laboratories, Inc.
(the "Company") to be maintained as a unified position in order that the
Partnership shall be assured of a significant stake and voice in the affairs of
the Company, and (iii) to acquire on behalf of the Partnership such other
properties to hold for investment, and to operate and/or sell such other
property as the General Partners determine, in their sole discretion, to be in
the best interest of the Partnership, including, without limitation, assets or
investments that may require minimum levels of investment that are

                                       2
<PAGE>

more easily satisfied by the Partnership than by individual Partners, or
that may require sophisticated management skills.

     3.3  General Partners' Authority to Fulfill Purposes.
          -----------------------------------------------

          The General Partners shall have and may exercise such powers as are
necessary and appropriate to fulfill the foregoing purposes, including, without
limitation, the retention and investment of excess cash of the Partnership as
operating or capital reserves, as reserves for future acquisitions or otherwise,
in any prudent and reasonable manner which the General Partners deem
appropriate, consistent with their fiduciary duties to the Partners, in order to
further the interests of the Partnership.

4.   Partners.
     --------

     The Partnership shall have the Partners listed on Exhibit A.
                                                       ---------

     4.1  General Partners.
          ----------------

          David Schwartz and Alice Schwartz as Co-Trustees of the Schwartz
Revocable Trust, Norman Schwartz, as his sole and separate property, and Steven
Schwartz, as his sole and separate property, shall be the General Partners.
Additional General Partners may only be admitted to the Partnership as
specifically provided in this Agreement.  Any General Partner is authorized to
take such actions as are necessary to form the Partnership, and to carry out the
business of the Partnership, but only upon the consent of the requisite number
of General Partners as set forth in Article 9.

                                       3
<PAGE>

     4.2  Limited Partners.
          ----------------

          The persons and entities set forth on Exhibit A shall be the initial
                                                ---------
Limited Partners.  No person or entity may be substituted or added as a Limited
Partner except as specifically provided in this Agreement.

5.   Capital Contributions.
     ---------------------

     Each General Partner and Limited Partner shall contribute undivided
interests in the Stock to the Partnership, and the Partnership shall issue Units
to each Partner in exchange therefor, as set forth on Exhibit A, which is
                                                      ---------
incorporated herein by this reference.  The parties intend that the allocation
of Units is proportionate based on the relative agreed fair market value of such
contributions, as set forth on Exhibit A, provided that such initial values
                               ---------
shall be adjusted based upon a subsequent appraisal of such relative values
and/or any final determination of such values for federal tax purposes.

     5.1  No Withdrawals.
          --------------

          A Partner shall not have the right to a return of all or any part of
its capital contribution except upon the termination and dissolution of the
Partnership as provided in this Agreement.  No Partner shall receive interest on
such Partner's capital contribution to the Partnership.

     5.2  Additional Capital Contributions.
          --------------------------------

          Each Partner shall make additional capital contributions to the
Partnership at such time and in such amounts as determined by the General
Partners, in the same proportion as the number of Units held by such Partner
bears to the total number of Units outstanding.  The General Partners shall
notify each Partner in writing at least thirty (30) days prior to the required

                                       4
<PAGE>

additional capital contribution.  If any Partner fails to make such additional
capital contributions, then the capital accounts of the Partners who do make
such additional capital contributions shall be increased by the amount of such
capital contributions, and each contributing Partner shall be issued additional
Units to reflect the Partners' respective aggregate capital contributions in
proportion to the total capital contributions of all Partners.  There shall be
no other remedy for the failure of a Partner to make an additional contribution.
No Partner shall have the right to make voluntary capital contributions without
the consent of the General Partners.  If any Partner makes a loan to the
Partnership, such loan shall not increase the lending Partner's capital account
nor entitle the lending Partner to any greater share of Partnership profits,
credits or distributions, nor subject the lending Partner to any greater
proportion of Partnership losses.  The amount of the loan shall be a debt owed
by the Partnership to the lending Partner, and repayable on such commercially
reasonable terms and conditions as shall be agreed upon by the lending Partner
and the General Partners.

6.   Partner's Capital Accounts.
     --------------------------

     The Partnership shall maintain a separate capital account for each Partner
(the "Capital Account") in accordance with Subchapter K of the Internal Revenue
Code of 1986, as amended (the "Code"), and the Treasury Regulations promulgated
thereunder (the "Regs").  The Capital Account of each Partner shall be increased
by the amount of money and the agreed fair market value of any property
contributed by the Partner to the Partnership (net of liabilities securing such
contributed property that the Partnership is considered to assume or take
subject to under Section 752 of the Code).  All net income allocated to a
Partner under Section 7.2 below and additional capital contributions by a
Partner, if any, shall increase the Capital Account of such Partner.  All net
losses allocated to a Partner and all distributions from the Partnership (other
than

                                       5
<PAGE>

distributions in repayment of any principal and interest on loans and
reimbursement of expenses) to a Partner, and the amount of any tax credits
allocated to a Partner, to the extent that the allowance of such tax credit
results in the reduction in basis of the related property, shall decrease such
Partner's Capital Account. Loans by any Partner shall not be considered
contributions to the capital of the Partnership.

7.   Net Income (Profits), Net Losses and Distributions.
     --------------------------------------------------

     7.1  Accounting for Net Income (Profits) or Net Losses.
          -------------------------------------------------

          The net income (profits) or net losses of the Partnership for
financial accounting and federal income tax purposes shall be determined in
accordance with federal income tax principles, including the deductions for cost
recovery and/or amortization of all Partnership assets and expenditures, by
using the cash method consistently applied from year to year as determined by
the Partnership's accountants.

     7.2  Allocation of Net Income (Profits) or Net Losses and Income Tax
          ---------------------------------------------------------------
Credits.
- -------

          (a)  Net Income. For Partnership accounting and tax purposes, all net
               ----------
          income (profits) or net losses of the Partnership and all income tax
          credits shall be allocated to each Partner in the same proportion as
          the number of Units held by such Partner bears to the aggregate number
          of Units outstanding (the "Partner Percentages").

          (b)  Losses; Negative Capital Accounts.  Notwithstanding the
               ---------------------------------
          foregoing, no loss shall be allocated to any Partner which would
          result in such Partner's Capital Account (as increased by that
          Partner's share of "Minimum Gain" as defined below) to fall below zero
          after taking into account all reasonably anticipated

                                       6
<PAGE>

          distributions, and any such excess loss shall instead be allocated
          among those Partners who are deemed to be entitled to such losses in
          accordance with Sections 704 and 752 of the Code and corresponding
          Regs, pro rata based on their respective Partner Percentages (defined
          below). In the event that any Partner's Capital Account (as increased
          by that Partner's share of "Minimum Gain" as defined below) is at any
          time below zero, Partnership net income shall be first allocated among
          the Partners with negative Capital Account balances proportionately
          (based on their relative negative balances) until each of their
          Capital Accounts have been restored to zero. In addition, the
          "Qualified Income Offset" provisions set forth in the Regs promulgated
          under Section 704(b) of the Code shall be applied.

          (c)  Minimum Gain.  "Minimum Gain" shall mean the amount of gain that
               ------------
          the Partnership would realize if, in a taxable transaction,
          Partnership property was disposed of in full satisfaction of the
          nonrecourse liabilities to which the property is subject, determined
          by aggregating the amount of gain that the Partnership would realize
          with respect to each nonrecourse liability of the Partnership and
          otherwise in accordance with Regs Section 1.704-2(d) and -2(g).

     7.3  Distributions.
          -------------

          Distributions of cash or other property shall be made to each Partner
in accordance with the Partner Percentages.  Such distributions shall be made in
such amounts and at such times as the General Partners shall from time to time
determine to be in the best interests of the Partnership in their sole
discretion, with due regard for the maintenance of appropriate capital and
contingency reserves, and the purpose of the Partnership to accumulate capital
for

                                       7
<PAGE>

possible purchase of additional stock and for additional investment
opportunities. In the event of a permitted assignment of Partnership Units as
provided in Article 10 below, all allocations and distributions provided in this
Agreement which are attributable to the period during which such transfer of
ownership occurred shall be apportioned between the Partner and its assignee in
any manner that the General Partners shall determine to be permitted by relevant
federal and state partnership tax law.

     7.4  Section 704(c) - Special Rule for Contributed Property.
          ------------------------------------------------------

          If property contributed by any Partner to the Partnership has an
adjusted basis for federal and state income tax purposes which differs from the
fair market value of such property on the date of contribution, allocations of
depreciation, amortization, income, gain or loss with respect to such property
shall be allocated among the Partners so as to take into account any such
variation between the adjusted basis of such property and its fair market value
utilizing the "traditional method" described in Regs Section 1.704-3(b).
Allocations pursuant to this Section 7.4 are solely for purposes of federal,
state and local taxes and shall not affect any Partner's Capital Account or
share of distributions.

     7.5  Corrective Amendments for Tax Purposes.
          --------------------------------------

          The tax allocations and distributions under this Agreement are
intended to comply with Section 704 of the Code and any other related provisions
of the Code and/or Regs and are to be interpreted accordingly.  In the event
that the General Partners determine that it is necessary to amend this Agreement
in order to so comply, then the General Partners are hereby authorized to make
such an amendment without further action, provided that no such amendment shall
change the economic distributions otherwise provided under this Agreement.

                                       8
<PAGE>

8.   Liabilities.
     -----------

     8.1  Limited Liability of a Limited Partner.
          --------------------------------------

          A Limited Partner shall not be bound by, liable for or subject to any
loss, liability, obligation or expense of the Partnership except to the extent
of its capital contribution to the Partnership and its share of undistributed
Partnership profits.  Except as otherwise provided under Article 7, any losses
of the Partnership for which the Partnership is liable in excess of the amount
of the capital of the Partnership and/or other guaranties of Partnership
obligations, if any, shall be borne, proportionately by the General Partners.
Notwithstanding the foregoing, a Limited Partner shall be obligated to return to
the Partnership a part or all of any distribution if so required by applicable
law.

     8.2  Indemnification.
          ---------------

          The General Partners shall not be liable, responsible or accountable
in damages or otherwise to the Partnership or to the Limited Partners for any
acts or omissions performed or omitted in good faith and reasonably believed to
be within the scope of the authority conferred by this Agreement, or for
performance or omission to perform any acts on advice of the accountants or
legal counsel of the Partnership.  Under no circumstances shall the General
Partners be liable for any indirect or consequential damages arising from any
other party's breach of this Agreement.  The Partnership shall indemnify, defend
and hold harmless the General Partners, and each of them, from any and all
expenses, losses, damages and/or costs, including attorney's fees (collectively
"Damages"), incurred by the General Partners including Damages caused directly
or indirectly by reason of any acts or omissions to act by the General Partners
under this Agreement, except to the extent that Damages result from the gross
negligence or willful misconduct of a General Partner, in which case
indemnification shall be withheld from

                                       9
<PAGE>

that General Partner only. Any Damages to be paid under this Section 8.2 shall
be provided out of and to the extent of Partnership assets only and the Limited
Partners shall not be personally liable therefor.

9.   Management.
     ----------

     9.1  General Partners as Manager.
          ---------------------------

          The General Partners shall have exclusive control over the business
and management of the Partnership and the determination of its business
policies, and shall have all the rights, powers, and duties usually vested in
the general partners of a partnership organized for the purposes set forth in
Section 3 hereof.  The General Partners shall be responsible for the day-to-day
administration of the Partnership's business.  If more than one person or entity
are serving as General Partner, then the General Partners shall act by majority
vote (based upon their relative Partner Percentages) except as otherwise
specifically provided in this Agreement.  The General Partners shall be entitled
to reasonable compensation from the Partnership for any services rendered to the
Partnership at a rate comparable to other similarly situated providers.  The
General Partners are authorized to delegate to any General Partner such
authority to act on behalf of the Partnership as the General Partners determine
appropriate from time to time.  Subject to the provisions of Section 9.2 below,
the General Partners' powers shall include, without limitation, the following,
any or all of which may be delegated to any one General Partner as provided
above:

          (a)  Documents.  To execute and deliver, in the name of the
               ---------
          Partnership, agreements, documents, deeds of trust, mortgages,
          promissory notes, security agreements, leases, including the leases of
          the Partnership property and instruments relating to the purchase,
          leasing, operation, sale, franchising,

                                      10
<PAGE>

          licensing, financing and refinancing of Partnership property and any
          personal property included therein, proxies, voting trust
          certificates, and any other documents or instruments that are
          customarily signed by owners of stock.

          (b)  Expenditure, Reserves.  To expend or retain the capital and net
               ---------------------
          income of the Partnership in the prudent exercise of any of the rights
          and powers possessed by the General Partners hereunder, consistent
          with the purposes of the Partnership.

          (c)  Operations.  To purchase, finance, refinance, hold, lease,
               ----------
          manage, operate and improve Partnership property.

          (d)  Insurance.  To purchase from or through others and maintain at
               ---------
          all times contracts of liability, casualty and other insurance which
          the General Partners deem advisable, appropriate or convenient for the
          protection of the Partnership's assets or affairs or for any purposes
          beneficial to its assets.

          (e)  Investments.  To invest Partnership funds in government
               -----------
          securities, bankers' acceptances, stocks, bonds, mutual funds or any
          other investments which the General Partners deem prudent and
          appropriate.

          (f)  Bank Accounts.  To open, maintain and close bank accounts,
               -------------
          certificates of deposit and brokerage accounts (including margin
          accounts) and to draw checks and other orders for the payment of
          money.

          (g)  Tax Matters Partner.  To act as the Tax Matters Partner pursuant
               -------------------
          to Section 6231(a)(7) of the Code for all purposes thereunder and to
          otherwise make

                                      11
<PAGE>

          all federal and state tax elections applicable to the Partnership in
          the best interests of a majority in interest of the Partners.

          (h)  Professionals.  To employ any professional management firm or any
               -------------
          other qualified entity or individual for such purposes as the General
          Partners deem appropriate at the Partnership's sole expense,
          specifically including the employment of itself or any Partner or any
          party that is affiliated with or controlled by any Partner, provided
          that in all circumstances the management fee shall be commercially
          reasonable.

          (i)  Management.  To control and perform all other activities incident
               ----------
          to managing the operations and affairs of the Partnership, and to make
          all decisions regarding the business of the Partnership unless
          otherwise specifically limited in Section 9.2 below.

     9.2  Limitations on General Partners.
          -------------------------------

          Without obtaining the prior unanimous written consent of all Partners,
the General Partners shall not do any of the following:

          (a)  Do any act which would make it impossible to carry out the
          purposes of the Partnership;

          (b)  Confess a judgment against the Partnership;

          (c)  Execute or deliver any general assignment for the benefit of the
          creditors of the Partnership; or

                                      12
<PAGE>

          (d)  Do any act in contravention of this Agreement or the Certificate.

     9.3  Obligation of the General Partners to Provide Time and Skill to
          ---------------------------------------------------------------
Partnership.
- -----------

          The General Partners shall apply themselves diligently to the business
of the Partnership and devote as much time as is reasonably necessary to further
the business of the Partnership.  It is acknowledged and agreed that the General
Partners shall not be required to devote all of their business time to the
affairs of the Partnership and that the General Partners may be engaged in other
business activities, some of which may be similar to or in competition with the
Partnership.  No Partner shall have any duty to offer or present to the
Partnership any investment or future projects which it may locate.  The
provisions of this Section 9.3 shall apply to the trustee(s) or beneficiaries of
any trust which is a Partner of the Partnership.

     9.4  Limited Partner Has No Management Rights.
          ----------------------------------------

          A Limited Partner shall not have any right or authority to be active
in the conduct of the Partnership's business nor have any power or authority to
bind the Partnership in any contract, agreement, compromise or undertaking and a
Limited Partner shall take no action inconsistent herewith.

     9.5  Bank Deposits.
          -------------

          All funds contributed or advanced to the Partnership by the Partners
and all other funds received by the Partnership from whatever source shall be
deposited into a separate Partnership account or accounts in a bank or banks
selected by the General Partners.

     9.6  Reports, Books and Records.
          --------------------------

          (a)  Reports.  The General Partners shall cause to be delivered to the
               -------
          Partners annual written statements of the Partnership's financial
          condition and a report of

                                      13
<PAGE>

          the Partnership's profits or losses and cash flows for each year
          within a reasonable period after the end of the Partnership's fiscal
          year. After the close of each such year, the General Partners shall
          cause to be prepared the Partnership's federal and state income tax
          returns and shall deliver K-1 statements to each Partner. The General
          Partners may engage a certified public accountant or other
          professional at the Partnership's expense to review the books and
          records of the Partnership, to distribute to the Partners a report of
          such review, including a statement of gross receipts and operating
          expenses during such year, and to prepare appropriate tax returns and
          related information.

          (b)  Books and Records.  At all times during the term of the
               -----------------
          Partnership, and beyond that term if the General Partners deem it
          necessary, the General Partners shall keep or cause to be kept books
          of account in which each Partnership transaction shall be entered
          fully and accurately. All Partnership books of account, along with the
          following items, shall be maintained by the General Partners:

               (1)  A current list of the full name and last known business or
               residence of each Partner set forth in alphabetical order
               together with the contribution and the share in profits and
               losses of each Partner;

               (2)  A copy of the Certificate and all certificates of amendment
               thereto, together with executed copies of any powers of attorney
               under which any certificate has been executed;

                                      14
<PAGE>

               (3)  Copies of the Partnership's federal, state, and local income
               tax or information returns and reports, if any, for the six most
               recent taxable years;

               (4)  Copies of the original Partnership Agreement and all
               amendments thereto;

               (5)  Financial statements of the Partnership for the six most
               recent calendar years ;

               (6)  The Partnership's books and records for at least the current
               and past three calendar years.

          Such documents shall be kept at the Partnership's principal office and
shall be available during normal business hours for inspection and copying by
the Partners or their representatives. Upon the reasonable request of a Partner,
the General Partners shall deliver to any Partner the information required to be
maintained under (1)-(6) above.

          (c)  Fiscal Year; Accounting Method.  The fiscal year of the
               ------------------------------
          Partnership for all purposes shall be a calendar year. The Partnership
          shall utilize the cash method of accounting for tax and financial
          reporting purposes.

     9.7  Agent for Service of Process.
          ----------------------------
          The Partnership hereby appoints David Schwartz as its agent for
service of process.

                                      15
<PAGE>

10.  Transfer of Partnership Interests.
     ---------------------------------

     10.1 By Limited Partner.
          ------------------

          (a)  Upon Consent of Partners.  Except with regard to Permitted
               ------------------------
          Transfers as defined below, no Limited Partner, including any
          representatives, successors or assigns of a Limited Partner, may sell,
          exchange, assign, transfer, pledge, hypothecate, gift or otherwise
          dispose of any Unit or any other interest in the Partnership,
          (collectively a "Transfer") unless such Limited Partner, or its
          representative or other successor-in-interest, obtains (i) the
          unanimous prior written consent of the General Partners, (ii) the
          prior written consent of Limited Partners owning a majority in
          interest of the Limited Partners Units (in each case consent may be
          withheld in each such Partner's sole discretion), and (iii) the
          requisite consent, if any, required as a condition of any such
          transfer for any underlying asset of the Partnership. A transfer for
          purposes of this Section 10.1 shall include the transfer of beneficial
          ownership of any Unit held by any trust which is a Partner hereof, or
          the transfer of any Unit upon the termination of the trust to a person
          or entity which is not a Permitted Transferee as defined below.

          (b)  Permitted Transfers/Permitted Transferees.  No such prior written
               -----------------------------------------
          consent under Section 10.1(a) shall be required with respect to the
          Transfer of any Limited Partner's Units: (i) to any other Partner;
          (ii) to any of the issue of David Schwartz or Alice Schwartz; or (iii)
          to a trust for the primary benefit of David Schwartz, Alice Schwartz,
          the issue of either of them, and/or the spouse of any such issue,
          provided, that one or more of the group consisting of David Schwartz,
          --------
          Alice Schwartz, any of the issue of David Schwartz or Alice Schwartz,
          and/or any other

                                      16
<PAGE>

          existing Partners serving as trustee(s) thereof with sufficient voting
          authority with respect to the Unit to control any material matter
          affecting such Unit and, provided further, that upon termination of
                                   -------- -------
          such primary beneficiary's interest in the trust, the trust's Units
          pass to a Permitted Transferee as defined in this Section 10.1
          (cumulatively, subparagraphs (i), (ii), and (iii) shall be referred to
          as "Permitted Transfers" and the recipients thereunder as "Permitted
          Transferees"). For purposes of this Section 10.1, the term "issue"
          shall include any adopted child who was a minor at the time of
          adoption.

     10.2 By General Partner.
          ------------------

          (a) As General Partner Units  A General Partner may Transfer his or
              ------------------------
her Units as General Partner Units to any existing General Partner or to any
person who is the issue of David Schwartz or Alice Schwartz.

          (b) As Limited Partner Units  Subject to subsection 10.2 (c) below, a
              ------------------------
General Partner may Transfer his or her Units as Limited Partner Units to any
Permitted Transferee.

          (c) Conversion of General Partner Units  Under any circumstances
              -----------------------------------
described in Section 10.2 (b), or Section 10.4 concerning a General Partner in
which the Units of the General Partner are not purchased (and an election is
made to continue the Partnership under Section 11.2 hereof, if applicable), or
upon a General Partner's resignation as a General Partner, then such General
Partner's interest in the Partnership shall be converted to an equivalent
interest as a Limited Partner and the remaining or substitute General Partner(s)
shall continue to serve as General Partner(s).

                                      17
<PAGE>

          (d)  Other Transfers  Except as specifically provided in subsection
               ---------------
10.2 (a), (b), or (c), no General Partner may Transfer his or her Units (i) as
General Partner Units unless the Partners unanimously consent to such transfer,
or (ii) as Limited Partner Units unless the consent provisions of section
10.1(a) are satisfied.

     10.3 Transfers in Violation of Section 10.1.
          --------------------------------------

          Any transfer of a Unit in violation of Section 10.1 or Section 10.2
shall be null and void and of no force and effect whatsoever.  Should a Partner
attempt to make a testamentary transfer to a person or entity that is not a
Permitted Transferee (or upon the change in beneficial ownership of any trust
which is a Partner to a person or entity other than a Permitted Transferee),
then the Partnership shall have the right to purchase such Unit on the terms and
conditions set forth in Section 10.4 from the successor-in-interest of said
deceased Partner (or the trustee of a trust which is a Partner).

     10.4 Purchase of Units in the Event of Bankruptcy, Insolvency, Divorce or
          --------------------------------------------------------------------
     Other Prohibited Transfer.
     -------------------------

          The provisions of this Section 10.4 shall apply in the event of (i)
the Bankruptcy of a Partner (as such term is defined in Section 11.4 below),
(ii) the placement of a charge against one or more Units held by a Partner under
any law, order or process of court, or the immediate threatened enforcement of
any lien against one or more Units held by a Partner herein and the failure to
vacate or rescind the same within thirty (30) days thereafter, (iii) the
attempted transfer of one or more Units, or the transfer of a beneficial
interest in a trust which is a Partner, to a person or entity which is not
permitted or allowed under Section 10.1, or (iv) a dissolution of marriage
resulting in a person who is not the issue of David Schwartz or Alice Schwartz
owning one or more Units in the Partnership (or beneficial interest in a trust
which is a Partner) as part of

                                      18
<PAGE>

the decree of or settlement of such marital dissolution. Subject to the
provisions of Section 11, in any of the foregoing events the Partnership may, at
its option (the "Purchase Option"), purchase the Units held by that Partner,
proposed transferee or successor-in-interest, as the case may be (each of whom
is referred to as the "Seller"), upon the terms and conditions herein provided.
Such Purchase Option shall be assignable by the Partnership to one or more
Permitted Transferee(s), upon a majority vote (based on relative Partnership
Units) of the unaffected Partners. If the Partnership does not agree to exercise
its Purchase Option, then the other Partners shall have the same Purchase Option
allocated in any manner in which they agree, or if they can not agree then
proportionally based upon the relative Partnership Units of those Partners who
wish to exercise the Purchase Option.

          (a) Exercise of Purchase Option. The Partnership may exercise the
              ----------------------------
          Purchase Option not later than ninety (90) days after the Price is
          determined under Section 10.4(b), by delivering notice of exercise to
          the Seller, with copies to all other Partners. If the Partnership (or
          its permitted assignee of the Purchase Option) does not elect to
          purchase all of the Units of the Seller, the other Partners who
          succeed to the Purchase Option shall have the right for an additional
          sixty (60) day period to purchase the remaining Units of the Seller,
          which Units shall be allocated between or among them as they may
          agree, or if they can not agree then in proportion to their respective
          Partner Percentages. In the event that the Purchase Option is duly
          exercised under this Section 10.4(a), then the purchasers shall be
          required to collectively purchase all of the Seller's Units under this
          Section 10.4.

                                      19
<PAGE>

          (b) Price. The price of the Units to be purchased under this Section
              -----
          10.4 shall be the price that a willing buyer aware of all of the
          terms, conditions and restrictions contained in this Partnership
          Agreement, and specifically taking into account the illiquidity, lack
          of marketability and lack of control attributable to such Units, and
          all other relevant circumstances, would pay for such Units in an all
          cash purchase, reduced by any loans and debts owed to the Partnership
          by the Seller (and/or the Partner whose Units are being sold). If the
          General Partners (or any one or more Partners as hereinbefore
          provided) and the representatives of the Seller are unable to agree on
          such price, then the Partnership's accountants shall determine such
          price at the sole expense of the Seller, and they may employ any
          appraiser or outside professional that they deem appropriate to assist
          in such determination, which determination shall be binding on all
          Partners and all other interested parties.

          (c) Payment. The Partnership or other purchaser may elect to pay the
              -------
          purchase price in cash or by a note payable in not more than ten (10)
          equal annual installments bearing interest at a rate equal to the
          appropriate applicable federal rate under Section 1274(d) of the Code
          in effect for the month of sale (but in no event higher than the
          maximum rate allowed by law). The note shall be prepayable without
          penalty and may be unsecured. The Partnership or other purchaser, as
          the case may be, may apply as a credit against the purchase price of
          the Seller's Units any payment made by the Partnership or such
          purchaser of all or part of any such lien or of the indebtedness
          reflecting any such charge on said Units, as applicable; provided,
                                                                   --------
          that in the event such payment is in excess of the purchase price, the
          Seller shall be indebted to the Partnership or such purchaser, as the
          case may be, for

                                      20
<PAGE>

          the amount of such excess in a demand obligation bearing interest at
          the Wells Fargo Bank reference rate, adjusted annually on the
          anniversary of the obligation

          (d) Continuation of Partnership. The Partnership shall not terminate
          ---------------------------
          by reason of a sale of any Units under this Section 10.4; provided
                                                                    --------
          that, in the case of a sale of the last General Partner's Units, the
          election under Section 11.2 has been made.

     10.5 Substituted Partners. No transferee of a Partner's Units who is not
          --------------------
     then a Partner shall become a substituted Partner unless (i) the relevant
     provisions of Section 10.1 or 10.2 have been fully satisfied, and (ii) the
     transferee has agreed in writing to all of the terms and conditions of this
     Agreement, including any amendments hereto.

     10.6 Investment Representation of Limited Partner.
          --------------------------------------------

          Notwithstanding any provisions of this Article 10 to the contrary,
each Limited Partner hereby represents and warrants to the Partnership that it
is accepting its Units in exchange for its capital contribution for investment
purposes for its own account and not with a view to distribution or sale thereof
to any party other than the existing Partners and their issue.

11.  Termination.
     -----------

     11.1 Terminating Events.
          ------------------

          Except as provided in Section 11.2 below, the Partnership shall
terminate and dissolve on the earlier of the date set forth in Section 2 above
or the happening of any of the following events:

          (a)  the withdrawal or demise of the last General Partner;

                                      21
<PAGE>

          (b) the unanimous vote of the General Partners together with a
          unanimous vote of the Limited Partners to terminate and dissolve the
          Partnership;

          (c) the Bankruptcy (as defined in Section 11.5 below) of the last
          General Partner or a general assignment by the last General Partner
          for the benefit of creditors, or the appointment of a receiver for the
          last General Partner's property or affairs;

          (d) the sale or other disposition (except an exchange for other real
          property) of all or substantially all of the Partnership's assets;

          (e) the dissolution of the Partnership by operation of law or judicial
          decree; and/or

          (f) the removal of the last General Partner as the General Partner of
          the Partnership by the prior unanimous written consent of the Limited
          Partners, or by the written consent of two-thirds (2/3) of the Partner
          Percentages of the Limited Partners in the event of the last General
          Partner's gross negligence or willful misconduct in the performance of
          its duties hereunder including, without limitation, its
          misappropriation of Partnership funds or its fraud committed upon the
          Partnership or any of the Partners.

     11.2 Election to Continue.
          --------------------

          Notwithstanding the provisions of Section 11.1 hereof, within sixty
(60) days following the occurrence of any of the events described in
subparagraphs (a), (c) or (f) of Section 11.1, the remaining Partners may elect
to continue the business of the Partnership by

                                      22
<PAGE>

appointing by unanimous vote a substitute General Partner which may be one of
the remaining Partners.

     11.3 Dissolution.
          -----------

          If the Partners do not elect to continue the Partnership within the
sixty (60) day period specified in Section 11.2, the Partnership shall be
dissolved at the expiration of said period.  If the election to continue the
Partnership under Section 11.2 is not applicable, then the Partnership shall be
dissolved forthwith.  Upon termination and dissolution of the Partnership, the
books of the Partnership shall be closed and all net profits or net losses shall
be allocated to the Partners in accordance with this Agreement.  The General
Partners or their successors-in-interest shall thereupon proceed to liquidate
the assets of the Partnership as soon as reasonably practicable, and the
Partnership shall engage in no further business thereafter other than that
necessary to liquidate and wind up the affairs of the Partnership and to
distribute Partnership assets.  Any Partnership assets distributed-in-kind shall
be valued at their fair market value (net of any liabilities to which they are
subject to) and any unrealized gain or loss shall be allocated to the Partners
as if such asset had been sold by the Partnership at its fair market value.  The
proceeds of liquidation of the Partnership assets shall be distributed in the
following order:

          (a) In payment of third-party Partnership debts (other than debts
          owing to Partners) in payment of expenses of dissolution and
          liquidation;

          (b) In the funding of any reserves which the General Partners deem
          reasonably necessary for any contingent or unforeseen liabilities or
          obligations of the Partnership or of the Partners arising out of or in
          connection with the Partnership;

                                      23
<PAGE>

          provided, however, that upon satisfaction of the above contingencies
          --------  -------
          the balance of such reserves shall be distributed in the manner
          provided below in this Section 11;

          (c) In payment of debts owing to the Partners by the Partnership
          including any unreimbursed expenses;

          (d) To the Partners pro rata in accordance with and to the extent of
          their positive Capital Accounts as adjusted for all of the
          transactions and distributions occurring prior to such distribution;

          (e) The balance, if any, to the Partners in the same proportion as the
          number of Units held by each Partner bears to the aggregate number of
          Units outstanding.

     11.4 Bankruptcy.
          ----------

          For the purposes of this Agreement, the term "Bankruptcy" with respect
to a Partner means: (i) the filing of a petition for relief as debtor or
bankrupt under the Bankruptcy Code of 1978, as amended, or any successor
statute; (ii) a general assignment for the benefit of creditors; (iii) the
filing of a petition or answer seeking any reorganization, arrangement,
composition, readjustment, liquidation, dissolution or similar relief under any
statute, law or regulation; (iv) the filing of an answer or other pleading
admitting or failing to contest the material allegations of a petition filed
against that Partner in a proceeding contemplated by clauses (i), (ii) or (iii)
or such Partner otherwise consenting to, acquiescing in or not contesting such
proceeding within thirty (30) days after such Partner has received notice
thereof; or (v) such Partner seeking, consenting to or acquiescing in the
appointment of a trustee, receiver or liquidator of all or substantially all of
its properties.

                                      24
<PAGE>

12.  Power of Attorney.
     -----------------

     12.1 General Partner Appointed as Attorneys-In-Fact.
          ----------------------------------------------

          Each Limited Partner irrevocably constitutes and appoints each of the
General Partners as its true and lawful attorney-in-fact, in its name, place and
stead, to make, execute, acknowledge, record and file: (i) any certificate or
other instrument which may be required by law to be recorded or filed by the
Partnership, or which the General Partners shall deem advisable to record or
file; (ii) any amendment to this Agreement actually approved by the Limited
Partners in accordance with Section 15.6 hereof, any amendment made for the
purpose of reflecting a transfer of Partnership Units made in accordance with
this Agreement, or any amendment made in accordance with Section 7.4; (iii) any
certificates, documents or instruments and any and all amendments, modifications
or cancellations as may from time to time be required or appropriate under the
laws of the State of California; and (iv) all other documents which may be
required to effectuate the dissolution and termination of the Partnership.

     12.2 Power Coupled With An Interest.
          ------------------------------

          The foregoing power-of-attorney shall be deemed to be coupled with an
interest and shall survive the delivery of an assignment by a Limited Partner of
the whole or any portion of its Units, except that where an assignee of such
Units has been approved by the General Partners as a substituted Limited
Partner, then the foregoing power-of-attorney of the assignor Limited Partner
shall survive the delivery of such assignment for the sole purpose of enabling
the General Partners to execute, acknowledge and file any and all instruments
necessary to effectuate such substitution.

                                      25
<PAGE>

     12.3 Substituted Limited Partner.
          ---------------------------

          By the execution of this Agreement by a substituted Limited Partner or
an agreement to be bound thereby, said substituted Limited Partner shall be
deemed to have given each of the General Partners a power-of-attorney coupled
with an interest which is identical to that which his or its assignor had given.

13.  Death, Incompetency or Dissolution of a Limited Partner.
     -------------------------------------------------------

     The death of a Limited Partner (or of the primary beneficiary of a trust
which is a Limited Partner), legal incompetence of a Limited Partner (or such
primary beneficiary), or dissolution of a Limited Partner shall not dissolve or
terminate the Partnership.  In such event, the legal representative or successor
of such Limited Partner shall have all of the rights of a Limited Partner in the
Partnership to the extent of the interest of the deceased or incompetent or
dissolved Limited Partner, subject to the terms and conditions of this
Agreement, and if the successor in interest (or beneficial owner) is not a
Permitted Transferee, then the provisions of Section 10.4 shall apply and, if
neither the Partnership nor the other unaffected Partners elect to purchase the
Units of such Limited Partner, the successor may become a Substitute Limited
Partner upon compliance with the provisions of Section 10.1(c).

14.  Election Under Section 754 of the Code; Waiver of Right of Partition.
     --------------------------------------------------------------------

     14.1 Election Under Section 754 of the Code.
          --------------------------------------

          At the request of any Partner, the General Partners shall cause the
Partnership to timely make the election provided in, and in accordance with,
Section 754 of the Code and the Regs thereunder, and the General Partner may
charge any additional Partnership accounting or

                                      26
<PAGE>

legal expense incurred in connection with the election and continuing
implementation of such election to such requesting Partner.

     14.2 Waiver of Right of Partition.
          ----------------------------

          Having previously been advised that it may have a right to bring an
action for partition, each of the Partners does hereby irrevocably waive for the
duration of this Agreement any right or power any such Partner might have to
cause the Partnership or any of its assets to be partitioned or compel any sale
of all or any portion of the assets of the Partnership pursuant to any
applicable law or laws.

15.  Miscellaneous.
     -------------

     15.1 Notices.
          -------

          All notices under this Agreement shall be in writing, and shall be
given to a party at the address set forth next to the party's signature below or
at such other address as it may submit to the General Partner and to the
Partnership at its principal office.

     15.2 Pronouns.
          --------

          Personal pronouns used herein shall be construed as that of the gender
and number required by the context.

     15.3 Capacity.
          --------

          Each of the Partners expressly desires and intends that corporations,
trusts, partnerships and any other form of legal entity, as well as natural
persons, may pursuant hereto become a partner of the Partnership, hold
Partnership Units and act through the individuals who from time to time are
representatives thereof (as officers, trustees, partners or otherwise).

                                      27
<PAGE>

     15.4 Binding Effect.
          --------------

          This Agreement shall inure to the benefit of and bind the parties
hereto and their respective successors, assigns, representatives, estates, heirs
or legatees.

     15.5 Agreement in Counterparts.
          -------------------------

          This Agreement may be executed in several counterparts, all of which
constitute one and the same agreement, binding on all the parties hereto,
notwithstanding that all the parties may not be signatories to the same
counterpart.

     15.6 Amendment of Agreement.
          ----------------------

          This Agreement may be amended only by a written instrument signed by
the General Partner and Limited Partners owning at least eighty percent (80%) of
all of the outstanding Limited Partner Units.  Notwithstanding the foregoing,
any provision herein requiring the approval and consent of all of the Partners
or all of the Limited Partners may not be amended without the prior written
consent of all of the Partners or of all of the Limited Partners, as the case
may be.

     15.7 Governing Law; Consent to Binding Arbitration; Jurisdiction and Venue.
          ---------------------------------------------------------------------

          This Agreement shall be governed by and construed in accordance with
California law.  Each party hereby expressly agrees that any dispute among the
Partners relating in any way to the Partnership or this Agreement shall be
resolved by binding arbitration to be conducted in any manner that they agree,
or if they can not agree, then such arbitration shall be conducted in Alameda or
Contra Costa County in accordance with the commercial rules of the American
Arbitration Association.  If any arbitration award is required to be submitted
to court for enforcement, then each Party consents to the sole jurisdiction of
the California courts and agrees

                                      28
<PAGE>

that any action relating to or arising out of this Agreement shall be instituted
and prosecuted only in the Municipal or Superior Court of the City and County of
Alameda or Contra Costa, California, or the appropriate federal court located
therein. Each party waives any right to a change of venue and any and all
objections to the jurisdiction of the California courts.

     15.8 Attorneys' Fees.
          ---------------

          Should any litigation be commenced between or among the parties
concerning any provision of this Agreement or the rights and duties of any party
in relation thereto, the party prevailing in such litigation shall be entitled,
in addition to such other relief as may be granted, to a reasonable sum as and
for its attorneys' fees and for costs in accordance with Section 1717 of the
California Civil Code.

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

GENERAL PARTNERS:                LIMITED PARTNERS:

Schwartz Revocable Trust         Schwartz Revocable Trust

/s/ David Schwartz               /s/ David Schwartz
- ---------------------------      -----------------------
David Schwartz, Trustee          David Schwartz, Trustee


/s/ Alice Schwartz               /s/ Alice Schwartz
- ---------------------------      -----------------------
Alice Schwartz, Trustee          Alice Schwartz, Trustee


/s/ Norman Schwartz              /s/ Norman Schwartz
- ---------------------------      -----------------------
Norman Schwartz                  Norman Schwartz


/s/ Steven Schwartz              /s/Steven Schwartz
- ---------------------------      -----------------------
Steven Schwartz                  Steven Schwartz


                                 /s/ Norman Schwartz
                                 -----------------------------------------------
                                 Norman Schwartz, custodian for Allison Schwartz


                                 /s/ Norman Schwartz
                                 -----------------------------------------------
                                 Norman Schwartz, custodian for Julia Schwartz

                                      29
<PAGE>

                                   EXHIBIT A
                                   ---------

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------------
    GENERAL PARTNERS                 BIO-RAD CLASS B      PARTNERSHIP
                                         SHARES             UNITS
                                     CONTRIBUTED TO
                                      PARTNERSHIP
- --------------------------------------------------------------------------------
<S>                                  <C>                  <C>
Schwartz, Revocable Trust               12,180                 60
- --------------------------------------------------------------------------------

Norman Schwartz                          4,060                 20
- --------------------------------------------------------------------------------

Steven Schwartz                          4,060                 20
- --------------------------------------------------------------------------------

    LIMITED PARTNERS
- --------------------------------------------------------------------------------


Schwartz Revocable Trust             1,661,921              8,187
- --------------------------------------------------------------------------------

Norman Schwartz                        143,751                708
- --------------------------------------------------------------------------------

Steven Schwartz                        140,601                693
- --------------------------------------------------------------------------------

Allison Schwartz                        31,727                156
- --------------------------------------------------------------------------------

Julia Schwartz                          31,727                156
- --------------------------------------------------------------------------------

Total                                2,030,027             10,000
- --------------------------------------------------------------------------------
</TABLE>

                                      30


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