Document:

INTERCORPORATE SERVICES AGREEMENT

         This INTERCORPORATE SERVICES AGREEMENT (the "Agreement"),  effective as
of January 1, 2000, amends and supersedes that certain  Intercorporate  Services
Agreement  effective  as of  January 1, 1999  between  VALHI,  INC.,  a Delaware
corporation  ("Valhi"),  and COMPX  INTERNATIONAL  INC., a Delaware  corporation
("Recipient").

                                                         Recitals

         A.  Employees  and  agents of Valhi  and  affiliates  of Valhi  perform
management,  financial and administrative functions for Recipient without direct
compensation from Recipient.

         B. Recipient does not separately  maintain the full internal capability
to perform all necessary management, financial and administrative functions that
Recipient requires.

         C.  The cost of  maintaining  the  additional  personnel  by  Recipient
necessary to perform the functions  provided for by this Agreement  would exceed
the fee set  forth in  Section  3 of this  Agreement  and that the terms of this
Agreement are no less  favorable to Recipient  than could  otherwise be obtained
from a third party for comparable services.

         D. Recipient  desires to continue  receiving the management,  financial
and administrative  services presently provided by Valhi and affiliates of Valhi
and Valhi is willing to continue  to provide  such  services  under the terms of
this Agreement.

                                    Agreement

         For and in consideration of the mutual  premises,  representations  and
covenants herein contained, the parties hereto mutually agree as follows:

         Section 1. Services to be Provided.  Valhi agrees to make  available to
Recipient the following services (the "Services") to be rendered by the internal
staff of Valhi and affiliates of Valhi:

         (a) Consultation in the development and  implementation  of Recipient's
corporate business strategies, plans and objectives;

         (b)  Consultation  in management  and conduct of corporate  affairs and
corporate governance consistent with the charter and bylaws of Recipient;

         (c)  Consultation  in  maintenance  of financial  records and controls,
including preparation and review of periodic financial statements and reports to
be filed with public and  regulatory  entities and those required to be prepared
for financial institutions or pursuant to indentures and credit agreements;

         (d)  Consultation  in  cash  management  and  in  arranging   financing
necessary to implement the business plans of Recipient;

         (e)  Consultation  in tax  management  and  administration,  including,
without  limitation,  preparation  and  filing of tax  returns,  tax  reporting,
examinations by government authorities and tax planning;

         (f)  Consultation  with respect to employee benefit plans and incentive
compensation arrangements; and

         (g) Such other  services as may be  requested  by  Recipient  or deemed
necessary and proper from time to time.

         Section 2.  Miscellaneous  Services.  It is the  intent of the  parties
hereto that Valhi provide only the Services requested by Recipient in connection
with routine management,  financial and administrative  functions related to the
ongoing  operations  of  Recipient  and not with  respect to  special  projects,
including  corporate  investments,  acquisitions and  divestitures.  The parties
hereto  contemplate that the Services rendered in connection with the conduct of
Recipient's  business  will  be on a scale  compared  to  that  existing  on the
effective  date of this  Agreement,  adjusted for internal  corporate  growth or
contraction, but not for major corporate acquisitions or divestitures,  and that
adjustments  may be required to the terms of this Agreement in the event of such
major corporate acquisitions,  divestitures or special projects.  Recipient will
continue to bear all other costs required for outside  services  including,  but
not  limited  to,  the  outside  services  of  attorneys,   auditors,  trustees,
consultants, transfer agents and registrars, and it is expressly understood that
Valhi assumes no liability for any expenses or services  other than those stated
in Section 1. In addition to the fee paid to Valhi by Recipient for the Services
provided  pursuant to this Agreement,  Recipient will pay to Valhi the amount of
out-of-pocket costs incurred by Valhi in rendering such Services.

         Section 3. Fee for Services.  Recipient agrees to pay to Valhi $139,000
quarterly, commencing as of January 1, 2000, pursuant to this Agreement.

         Section  4.  Original  Term.  Subject  to the  provisions  of Section 5
hereof,  the original  term of this  Agreement  shall be from January 1, 2000 to
December 31, 2000.

         Section  5.   Extensions.   This  Agreement  shall  be  extended  on  a
quarter-to-quarter  basis  after the  expiration  of its  original  term  unless
written  notification is given by Valhi or Recipient thirty (30) days in advance
of the first day of each  successive  quarter  or unless it is  superseded  by a
subsequent written agreement of the parties hereto.

         Section  6.   Limitation  of  Liability.   In  providing  its  Services
hereunder,  Valhi shall have a duty to act, and to cause its agents to act, in a
reasonably prudent manner, but neither Valhi nor any officer, director, employee
or agent of Valhi or its  affiliates  shall be liable to Recipient for any error
of  judgment  or  mistake  of law or for  any  loss  incurred  by  Recipient  in
connection  with the  matter  to which  this  Agreement  relates,  except a loss
resulting from willful misfeasance, bad faith or gross negligence on the part of
Valhi.

         Section  7.  Indemnification  of Valhi by  Recipient.  Recipient  shall
indemnify and hold harmless Valhi, its affiliates and their respective officers,
directors  and  employees  from and  against  any and all  losses,  liabilities,
claims,  damages,  costs  and  expenses  (including  attorneys'  fees and  other
expenses of  litigation)  to which  Valhi or any such person may become  subject
arising out of the Services provided by Valhi to Recipient  hereunder,  provided
that such indemnity  shall not protect any person against any liability to which
such person  would  otherwise be subject by reason of willful  misfeasance,  bad
faith or gross negligence on the part of such person.

         Section 8. Further Assurances.  Each of the parties will make, execute,
acknowledge and deliver such other instruments and documents,  and take all such
other actions,  as the other party may reasonably  request and as may reasonably
be required in order to effectuate  the purposes of this  Agreement and to carry
out the terms hereof.

         Section 9. Notices.  All  communications  hereunder shall be in writing
and shall be addressed, if intended for Valhi, to Three Lincoln Centre, 5430 LBJ
Freeway, Suite 1700, Dallas, Texas 75240,  Attention:  President,  or such other
address as it shall have furnished to Recipient in writing,  and if intended for
Recipient,  to Two  Greenspoint  Plaza,  16825  Northchase  Drive,  Suite  1200,
Houston, Texas 77060, Attention: Chairman of the Board, or such other address as
it shall have furnished to Valhi in writing.

         Section 10. Amendment and Modification.  Neither this Agreement nor any
term hereof may be  changed,  waived,  discharged  or  terminated  other than by
agreement in writing signed by the parties hereto.

         Section 11.  Successors and Assigns.  This  Agreement  shall be binding
upon and inure to the  benefit  of Valhi  and  Recipient  and  their  respective
successors  and assigns,  except that neither  party may assign its rights under
this Agreement without the prior written consent of the other party.

         Section 12.  Governing  Law. This  Agreement  shall be governed by, and
construed and interpreted in accordance with, the laws of the state of Texas.

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
duly executed and delivered as of the date first above written.

                             VALHI, INC.

                             /s/ Bobby D. O'Brien
                       By:   ---------------------------------------
                             Bobby D. O'Brien
                             Vice President and Treasurer

                             COMPX INTERNATIONAL INC.

                             /s/ John A. Miller
                       By:   ---------------------------------------
                             John A. Miller
                             Vice President, Chief Financial Officer
                              and TreasurerEXHIBIT 4.1
                                                                     -----------

                              IMMUCELL CORPORATION

Common Stock Purchase Warrant issued by the Registrant to AMBI Inc. dated April
12, 2000

<PAGE>

Neither this Warrant nor the shares of Common Stock issuable on exercise of this
Warrant have been registered under the Securities Act of 1933. None of such
securities may be transferred in the absence of registration under such Act or
an opinion of counsel to the effect that such registration is not required.

                              IMMUCELL CORPORATION

                                     WARRANT

Dated: April 12, 2000

Number of Shares: 50,000

Holder:  AMBI INC.

Address:  4 Manhattanville Road, Purchase, New York 10577

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

THIS CERTIFIES THAT the Holder is entitled to purchase from IMMUCELL
CORPORATION, a Delaware corporation (hereinafter called the "Company" or "IC")),
the number of shares of the Company's common stock ("Common Stock") set forth
above, at an Exercise Price equal to $5.29.

1.    Exercise.

     (a) This Warrant may be exercised in whole or in part at any time prior to
         expiration, except as set forth in Section 2. This Warrant may be from
         time to time exercised by the Holder, in whole or in part, by the
         surrender of this Warrant, duly endorsed, at the principal office of
         the Company and upon payment to the Company of the purchase price of
         the Common Shares purchased. Payment of the purchase price shall be
         made by (x) certified or official bank check or checks payable to the
         order of the Company or (y) agreement by the Holder to receive, in lieu
         of the number of shares otherwise issuable on such exercise, that
         number of Common Shares determined by dividing (A) the difference
         between the aggregate Market Price (as hereinafter defined) of the
         Common Shares issuable in respect of the Warrant so surrendered and the
         aggregate Exercise Price in respect of the Warrant or portion thereof
         so surrendered by (B) the Market Price per Common Share. The
         certificate(s) for such Common Shares shall be delivered to the Holder
         within a reasonable time, not exceeding five days, after the Warrants
         evidenced hereby shall have been so exercised and a new Warrant
         evidencing the number of Common Shares remaining to be issued upon
         exercise of the Warrant shall also be issued to the Holder within such
         time unless such Warrant shall have expired.

     (b) The term "Market Price" shall mean, for any day, the average of the
         last sale price for the Common Shares during the immediately preceding
         10 trading days on which the shares

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<PAGE>

         were traded on the principal securities exchange on which the Common
         Shares are listed or admitted to trading or if the Common Shares shall
         not be listed on such exchange or system, the closing bid price in the
         over-the-counter market, in each such case, unless otherwise provided
         herein, averaged over a period of five consecutive business days prior
         to the day as of which Market Price is being determined. If at any time
         the Common Shares are not listed on any such exchange or such system or
         quoted in the over-the-counter market, the Market Price of the Common
         Shares shall be deemed to be (an "Off-Exchange Price Determination")
         the fair value thereof, as determined in good faith by an independent
         appraisal firm selected by the Holder and reasonably acceptable to the
         Company and whose expenses shall be shared equally by the Company and
         the Holder.

2.   Reference is a made to a License and Sublicense Agreement dated as of the
     date of this Warrant (the "Agreement") between Holder and IC. This warrant
     shall not be exercisable unless and until the date (the "Vesting Date") of
     the first governmental approval of a LICENSED PRODUCT (as defined in the
     Agreement).

3.   All rights granted under this Warrant shall expire on the earlier of (i)
     April 12, 2003 if vesting has not occurred by that date, or (ii) the fourth
     anniversary of the Vesting Date.

4.   This Warrant and the Common Stock issuable on exercise of this Warrant (the
     "Underlying Shares") may be transferred, sold, assigned or hypothecated,
     only if registered by the Company under the Securities Act of 1933 (the
     "Act") or if the Company has received from counsel to the Company a written
     opinion to the effect that registration of the Warrant or the Underlying
     Shares is not necessary in connection with such transfer, sale, assignment
     or hypothecation. The Holder shall through its counsel provide such
     information as is reasonably necessary in connection with such opinion. The
     Warrant and the Underlying Shares shall be appropriately legended to
     reflect these restrictions and stop transfer instructions shall apply.

5.   Any permitted assignment of this Warrant shall be effected by the Holder by
     (i) executing the form of assignment at the end hereof, (ii) surrendering
     the Warrant for cancellation at the office of the Company, accompanied by
     the opinion of counsel to the Company referred to above, the cost of which
     shall be shared equally by the Company and the holder; and (iii) unless in
     connection with an effective registration statement which covers the sale
     of this Warrant and or the shares underlying the Warrant, delivery to the
     Company of a statement by the transferee (in a form acceptable to the
     Company and its counsel) that such Warrant is being acquired by the Holder
     for investment and not with a view to its distribution or resale; whereupon
     the Company shall issue, in the name or names specified by the Holder
     (including the Holder) new Warrants representing in the aggregate rights to
     purchase the same number of Shares as are purchasable under the Warrant
     surrendered. Such Warrants shall be exercisable immediately upon any such
     assignment of the number of Warrants assigned. The

                                       2
<PAGE>

     transferor will pay all relevant transfer taxes. Replacement warrants shall
     bear the same legend as is borne by this Warrant.

6.   The term "Holder" should be deemed to include any permitted record
     transferee of this Warrant. It is understood and agreed that this Warrant
     may not be transferred to any competitor of the Company or to any entity
     which may be making an offer to acquire control of the Company that is not
     supported by the Board of Directors of the Company.

7.   The Company covenants and agrees that all shares of Common Stock which may
     be issued upon exercise hereof will, upon issuance, be duly and validly
     issued, fully paid and non-assessable and no personal liability will attach
     to the holder thereof. The Company further covenants and agrees that,
     during the periods within which this Warrant may be exercised, the Company
     will at all times have authorized and reserved a sufficient number of
     shares of Common Stock for issuance upon exercise of this Warrant and all
     other Warrants.

8.   This Warrant shall not entitle the Holder to any voting rights or other
     rights as a stockholder of the Company.

9.   In the event that as a result of reorganization, merger, consolidation,
     liquidation, recapitalization, stock split, combination of shares or stock
     dividends payable with respect to such Common Stock, the outstanding shares
     of Common Stock of the Company are at any time increased or decreased or
     changed into or exchanged for a different number or kind of share or other
     security of the Company or of another corporation, then appropriate
     adjustments in the number and kind of such securities then subject to this
     Warrant shall be made effective as of the date of such occurrence so that
     the position of the Holder upon exercise will be the same as it would have
     been had it owned immediately prior to the occurrence of such events the
     Common Stock subject to this Warrant. Such adjustment shall be made
     successively whenever any event listed above shall occur and the Company
     will notify the Holder of the Warrant of each such adjustment. Any fraction
     of a share resulting from any adjustment shall be eliminated and the price
     per share of the remaining shares subject to this Warrant adjusted
     accordingly.

10.  This Warrant shall be governed by and construed in accordance with the laws
     of the State of Delaware. Service of process shall be effective if by
     certified mail, return receipt requested. All notices shall be in writing
     and shall be deemed given upon receipt by the party to whom addressed. This
     instrument shall be enforceable by decrees of specific performances well as
     other remedies.

IN WITNESS WHEREOF, the Company has caused this Warrant to be signed by its duly
authorized officers under Its corporate seal, and to be dated as of the date set
forth above.

IMMUCELL CORPORATION

By: /s/ Michael F. Brigham
       --------------------
Title: President and CEO

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