Document:

<PAGE>

                                                                     Exhibit 4.1

                              [FRONT OF SECURITY]

[Graphic depicting satellites, people, telephones, computers and other items
related to Hughes Electronics Corporation business]

GM CLASS H COMMON STOCK            PAR VALUE $0.10
NUMBER     SHARES
CHF000000
THIS CERTIFICATE IS TRANSFERABLE IN BOSTON OR NEW YORK

CUSIP 370442 83 2

SEE REVERSE FOR CERTAIN DEFINITIONS

HUGHES ELECTRONICS CORPORATION
A WHOLLY-OWNED SUBSIDIARY OF GENERAL MOTORS CORPORATION

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

This is to Certify that

is the owner of
FULLY PAID AND NON-ASSESSABLE SHARES OF THE CLASS H COMMON STOCK of General
Motors Corporation, transferable in person or by duly authorized attorney upon
surrender of this Certificate properly endorsed. This Certificate and the shares
represented hereby are subject to all the terms, conditions and limitations of
the Certificate of Incorporation and all Amendments thereto and Supplements
thereof. This Certificate is not valid until countersigned by the Transfer Agent
and registered by the Registrar.

GM CLASS H COMMON STOCK

Dated                  Witness the signatures of its duly authorized officers.

COUNTERSIGNED AND REGISTERED:
BankBoston, N.A.
TRANSFER AGENT
AND REGISTRAR,
BY

/s/                        /s/                        /s/
------------------------   ------------------------   ------------------------
AUTHORIZED SIGNATURE       SECRETARY                  CHAIRMAN, CHIEF EXECUTIVE
                                                      OFFICER AND PRESIDENT

                              [BACK OF SECURITY]

                          GENERAL MOTORS CORPORATION

     The following abbreviations, when used in the inscription on the face of
this certificate, shall be construed as though they were written out in full
according to applicable laws or regulations:

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

TEN COM - as tenants in common             UNIF GIFT MIN ACT -

TEN ENT - as tenants by the entireties       ____________Custodian____________
                                                (Cust)              (Minor)
JT TEN - as joint tenants with right of             under Uniform Gifts to
         survivorship and not as tenants
         in common                           Minors Act_______________________
                                                               (State)

    Additional abbreviations may also be used though not in the above list.

     THE CORPORATION WILL FURNISH WITHOUT CHARGE TO EACH STOCKHOLDER WHO SO
REQUESTS A STATEMENT OF THE RIGHTS, PRIVILEGES, RESTRICTIONS, VOTING POWERS,
LIMITATIONS AND QUALIFICATIONS OF THE SEVERAL CLASSES OF STOCK OF THE
CORPORATION. REQUESTS MAY BE DIRECTED TO THE CORPORATION OR THE TRANSFER AGENT.

     FOR VALUE RECEIVED, THE UNDERSIGNED HEREBY SELLS, ASSIGNS AND TRANSFERS THE
SHARES OF THE CAPITAL STOCK REPRESENTED BY THE WITHIN CERTIFICATE AS FOLLOWS:

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFYING NUMBER OF ASSIGNEE
------------------------------------

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

_________ UNTO _______________________________________________________________
 SHARES        FULL NAME AND ADDRESS (INCLUDING ZIP CODE) OF ASSIGNER SHOULD BE
               TYPEWRITTEN OR PRINTED LEGIBLY
_________   -   _______________________________________________________________

_________   -   _______________________________________________________________

_________   -   _______________________________________________________________
AND HEREBY IRREVOCABLY CONSTITUTES AND APPOINTS

______________________________________________________________________ ATTORNEY
TO TRANSFER THE SAID STOCK ON THE BOOKS OF THE WITHIN-NAMED CORPORATION WITH
FULL POWER OF SUBSTITUTION IN THE PREMISES.

DATED___________________

           SIGN HERE __________________________________________________________
                     SIGNATURE MUST CORRESPOND WITH NAME ON FACE OF CERTIFICATE

                                                            SIGNATURE GUARANTEED
--------------------------------------------------------------------------------<PAGE>

                                                                 Exhibit 10.30

December 16, 1999

Robert Cizik
Cizik LLC
Texas Commerce Tower
600 Travis, Suite 3628
Houston, Texas  77002

Dear Bob:

This letter agreement (the "Agreement") outlines the terms relating to Koppers
Industries, Inc.'s ("Koppers" or the "Company") retention of you in your
capacity as Senior Advisor to the Company.

Title:            Senior Advisor (Commencing January 1, 1999).

Scope of
Retention:        The Company hereby retains you to advise the Company"s Board
                  of Directors and its management with respect to, and to
                  provide leadership and oversight in connection with, the
                  establishment and execution of strategic and tactical business
                  plans, operating and management policies, and acquisition
                  strategies and opportunities to help position the Company for
                  the future and to provide any other advice, service and
                  consultations as you and the Company may mutually agree upon
                  from time to time, subject to your reasonable and convenient
                  availability.

Compensation:     (a) Monthly compensation for your activities as Senior Advisor
                  for the Company shall be at the rate of $12,500 per month
                  beginning January 1, 1999 and lasting for the period you also
                  continue to serve as Non-Executive Chairman of the Board of
                  Directors.

Term:             This Agreement shall be effective as of January 1, 1999 and
                  shall continue for the period in which you continue to serve
                  as Non-Executive Chairman of the Board of Directors of the
                  Company. This Agreement shall automatically terminate
                  effective upon the date you no longer serve as Non-Executive
                  Chairman of the Board of Directors of the Company.

Expense
Reimbursement:    You will receive reimbursement of all reasonable out-of-pocket
                  expenses including (a) reimbursement of first class travel
                  expenses and (b)
<PAGE>

                                                                 Exhibit 10.30

                  reimbursement of overnight stays in New York City at the
                  applicable rate for a suite at the Carlisle Hotel in Manhattan
                  (currently $550 per night).

Termination:      In the event of the termination of this Agreement, you will be
                  entitled to a $75,000 lump sum payment for consulting services
                  provided to the Company for a six month period. At the end of
                  said six-month period, your services on behalf of the Company
                  shall terminate and no other compensation shall be due or
                  payable.

Confidentiality:  You agree to maintain all information related to the Company
                  in confidence and not to divulge any confidential information
                  to any third party without the prior consent of the Company.

Indemnification:  The Company will indemnify you for any actions taken by you in
                  accordance with the indemnification provisions of the
                  Company's Bylaws and as permitted by the applicable
                  Pennsylvania business corporation laws.

Should the above meet with your approval, please be kind enough to sign and
return a copy of this letter to me.

Sincerely,

 /s/ Walter W. Turner
---------------------
Walter W. Turner
Chief Executive Officer

Accepted & Agreed to:

 /s/ Robert Cizik
-----------------
Robert Cizik
<PAGE>

                                                                 Exhibit 10.30

December 16, 1999

Robert Cizik
Cizik Interests
Texas Commerce Tower
600 Travis, Suite 3628
Houston, Texas  77002

Dear Bob:

This letter agreement (the "Agreement") outlines the terms relating to your
involvement with Koppers Industries, Inc. ("Koppers" or the "Company") as a
member of the Board of Directors and Non-Executive Chairman of the Board of
Directors.

Title:            Member of the Board of Directors (Commencing January 1, 1999).
                  Non-Executive Chairman of the Board of Directors (Commencing
                  July 1, 1999).

Scope of
Retention:        The Company hereby retains you to serve as a Member of the
                  Board of Directors and Non-Executive Chairman of the Board of
                  Directors of the Company and to perform the following services
                  in connection therewith:

                  (a) advise the Company"s Board of Directors and its management
                  with respect to, and to provide leadership and oversight in
                  connection with, the establishment and execution of strategic
                  and tactical business plans, operating and management
                  policies, and acquisition strategies and opportunities to help
                  position the Company for the future.

                  (b) provide any other advice, service and consultations as you
                  and the Company may mutually agree upon from time to time,
                  subject to your reasonable and convenient availability.

Compensation:     (a)  Applicable director fee per annum.

                  (b) 35,294 shares purchased at $17.00 per share, under a 5-
                  year vesting schedule, financed by a 10-year note.
<PAGE>

                                                                 Exhibit 10.30

Term:             This Agreement shall be effective as of January 1, 1999 and
                  shall continue, as applicable, for the period in which you
                  continue to serve as a member of the Board of Directors and as
                  Non-Executive Chairman of the Board of Directors of the
                  Company. This Agreement shall automatically terminate
                  effective upon the date you no longer serve as a member of the
                  Board of Directors or as Non-Executive Chairman of the Board
                  of Directors of the Company.

Investment:       You will have the option to make an initial investment of
                  $340,000 to purchase 20,000 shares of Koppers" common stock at
                  $17.00 per share.

Expense
Reimbursement:    Reimbursement of all reasonable out-of-pocket expenses
                  including (a) reimbursement of first class travel expenses and
                  (b) reimbursement of overnight stays in New York City at the
                  applicable rate for a suite at the Carlisle Hotel in Manhattan
                  (currently $550 per night).

Confidentiality:  You agree to maintain all information related to the Company
                  in confidence and not to divulge any confidential information
                  to any third party without the prior consent of the Company.

Indemnification:  The Company will indemnify you for any actions taken by you in
                  accordance with the indemnification provisions of the
                  Company's Bylaws and as permitted by the applicable
                  Pennsylvania business corporation laws.

Should the above meet with your approval, please be kind enough to sign and
return a copy of this letter to me.

Sincerely,

 /s/ Walter W. Turner
------------------------
Walter W. Turner
Chief Executive Officer

Accepted & Agreed to:

 /s/ Robert Cizik
-----------------
Robert Cizik
<PAGE>

                                                                 Exhibit 10.30

                                PROMISSORY NOTE
                                ---------------

$600,000                                           October 15, 1999

FOR VALUE RECEIVED, the undersigned, ROBERT CIZIK ("Borrower"), HEREBY PROMISES
TO PAY to the order of KOPPERS INDUSTRIES, INC., a Pennsylvania corporation
("Lender"), the principal sum of SIX HUNDRED THOUSAND DOLLARS ($600,000) (the
"Principal Amount") upon the terms and conditions contained herein.

1. Maturity Date.  The entire unpaid Principal Amount (together with
   --------------
any accrued but unpaid interest thereon) under this Note shall be due and
payable upon the first to occur of (a) August     , 2009 or (b) the date that
                                              ----
Borrower sells, transfers or otherwise disposes of the beneficial ownership of
the shares of common stock of the Lender (the AShares@) purchased with the
proceeds of this Note (the AMaturity Date@).

2.  Interest Rate.  No interest will accrue on the unpaid Principal Amount of
    --------------
this Note from the date upon which the Borrower receives such Principal Amount
until such Principal Amount is paid in full, provided that the Borrower remains
as the Non-Executive Chairman of the Lender.  In the event that Borrower
relinquishes the role of Non-Executive Chairman of the Lender, Borrower, in his
discretion, may elect to repay this Note in either of the following manners:

(a)  Borrower may repay the outstanding Principal Amount in its entirety at that
     time;

     or

(b)  Borrower may repay the outstanding Principal Amount on or before the
     Maturity Date with interest beginning to accrue on the date Borrower
     relinquishes the role of Non-Executive Chairman of Lender, at the
     applicable federal rate published in accordance with Section 1274 of the
     Internal Revenue Code of 1986, as amended.

3.  Limited Recourse.  Borrower shall be personally liable for payment of thirty
    -----------------
percent (30%) of the Principal Amount and any interest thereon (the ARecourse
Amount@).  Borrower shall not be personally liable for payment of the remaining
seventy percent (70%) of the Principal Amount (the ANonrecourse Amount@).  In
the event of a failure by Borrower to pay any portion of the Nonrecourse Amount,
Lender will look solely to the Shares given to secure payment of this Note.  The
foregoing limitation of liability shall not impair or otherwise affect the
validity or enforceability of (a) the debt evidenced by the Note or (b) Lender's
liens, security interests, rights and remedies with respect to the Shares.

4.  Manner and Place of Payments.  All amounts due and payable by the Borrower
    -----------------------------
to the Lender under this Note shall be paid in lawful money of the United States
of America at 436 Seventh Avenue, Pittsburgh, Pennsylvania, 15219, or at such
other place as the Lender may from time to time designate in writing.

5.  Prepayment.  The Borrower may, at any time prior to the Maturity Date,
    -----------
prepay all or any part of the Principal Amount without penalty.

6.  Waivers.  The Borrower and all parties becoming a party to this Note, or any
    --------
endorser or guarantor of this Note, expressly waive demand, presentment for
payment, protest, and notice of dishonor.
<PAGE>

                                                                   Exhibit 10.30

7.  Successors and Assigns; Amendment.  The provisions of this Note shall bind
    ---------------------------------
Borrower and his successors and assigns and inure to the benefit of Lender and
its successors and assigns.  This Note may not be changed, amended, modified or
discharged orally, but only by an instrument signed by Borrower and Lender.

8.  Notices.  All notices required or permitted by this Note shall be in writing
    --------
and shall be deemed to have been duly given when delivered against receipt, or
deposited in the United States mails, registered mail, postage prepaid, return
receipt requested, addressed to the Borrower at his address as it appears on the
records of the Lender and addressed to the Lender at its principal place of
business.  Either party may change the address to which notices are to be sent
by giving notice of such change of address in conformity with the foregoing
provision.

9.  Rights and Remedies; Non-Waiver.  Each right, power and remedy of the Lender
    --------------------------------
under this Note or under applicable law shall be cumulative and concurrent and
the exercise of any one or more of them shall not preclude the simultaneous or
later exercise by the Lender of any or all such other rights, powers or
remedies.  No failure or delay by the Lender to insist upon the strict
performance of any one or more provisions of this Note, or to exercise any
right, power or remedy consequent upon a breach of or default under this Note
shall constitute a waiver of performance or preclude the Lender from exercising
any such right, power or remedy.

10.  Governing Law.  This Note shall be governed, construed and enforced in
     --------------
strict accordance with the laws of the Commonwealth of Pennsylvania without
regard to any conflicts of laws principles which would cause the substantive law
of another jurisdiction to apply.  Borrower hereby consents to the jurisdiction
of the courts of the Commonwealth of Pennsylvania and agrees that venue shall be
proper in any county within the Commonwealth of Pennsylvania.

     IN WITNESS WHEREOF, Borrower has executed and delivered this Note as of the
  day and year first written above.

  WITNESS:                                                BORROWER:

                                                           /s/ Robert Cizik
                                                          -----------------
                                                          ROBERT CIZIK

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