CENTRUM INDUSTRIES INC
8-A12G/A, 1997-08-29
INDUSTRIAL TRUCKS, TRACTORS, TRAILORS & STACKERS
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<PAGE>   1


                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                   FORM 8-A/A

               FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12 (b) OR (g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                            CENTRUM INDUSTRIES, INC.
             (Exact name of registrant as specified in its charter)


                DELAWARE                               34-1654011
(State of incorporation or organization)  (I.R.S. Employer Identification No.)


            6135 Trust Drive
               Suite 104A
             Holland, Ohio                               43528
(Address of principal executive offices)               (Zip Code)


SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12 (b) OF THE ACT:


        Title of each class             Name of each exchange on which
        to be so registered             each class is to be registered

                None                                 None


     If this Form relates to the registration of a class of debt securities and
is effective upon filing pursuant to General Instruction A.(c)(1), please check
the following box. / /

     If this Form relates to the registration of a class of debt securities and
is to become effective simultaneously with the effectiveness of a concurrent
registration statement under the Securities Act of 1933 pursuant to General
Instruction A.(c)(2), please check the following box. / /

SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

                         COMMON STOCK,  $.05 PAR VALUE
                                (Title of class)

This Form 8-A/A, including all exhibits.  The Exhibit Index is located on page 
7.


<PAGE>   2


ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

GENERAL

     The authorized capital stock of the Registrant currently consists of
15,000,000 shares of Common Stock, par value $.05 per share, and 1,000,000
shares of Preferred Stock, par value $.05 per share.  As of August 15, 1997,
there were 8,463,237 shares of Common Stock outstanding held of record by 1,480
persons, and there were outstanding 70,000 shares of Participating Preferred
Stock held of record by one person.

COMMON STOCK

     Holders of Common Stock are entitled to one vote per share in all matters
to be voted on by the stockholders of the Registrant.  Subject to the approval
of the Registrant's secured and unsecured lenders and holders of Warrants (see
"Convertible Notes,"  "Warrants" and "Bank Covenants" below) and subject to
preferences that may be applicable to any Preferred Stock outstanding at the
time, holders of Common Stock are entitled to receive ratably such dividends,
if any, as may be declared from time to time by the Board of Directors out of
funds legally available therefor.  In the event of a liquidation, dissolution
or winding up of the Registrant, holders of Common Stock (including the holders
of Warrants, defined below) are entitled to share ratably in all assets
remaining after payment of the Registrant's liabilities and the liquidation
preference, if any, of any outstanding Preferred Stock (see "Preferred Stock"
below).  All of the outstanding shares of Common Stock are fully paid and
non-assessable.  Holders of Common Stock have no preemptive, subscription,
redemption or conversion rights.  The rights, preferences and privileges of
holders of Common Stock are set forth in the Registrant's Certificate of
Incorporation, as amended, which Certificate may be amended by the holders of a
majority of the outstanding shares entitled to vote on the issue.  The rights,
preferences and privileges of holders of Common Stock are subject to, and may
be adversely affected by, the rights of the Registrant's secured and unsecured
lenders and holders of Warrants (see "Convertible Notes,"  "Warrants" and
"Bank Covenants" below) and the rights of the holders of shares of any series
of Preferred Stock which the Registrant may designate and issue in the future
(see "Preferred Stock").

     Certain documentary provisions could have the effect of deterring certain
takeovers or delaying or preventing certain changes in control or management of
the Registrant.   The Registrant's Certificate of Incorporation, as amended,
eliminates the right of shareholders to act without a meeting and does not
provide for cumulative voting in the election of directors.  Upon the
occurrence of a "Change In Control Event," the holders of Warrants and
Convertible Notes have the right to require the Registrant to purchase all or a
portion of their outstanding securities and, after February 28, 1999, to
participate in the sale, transfer or exchange and in certain compensation paid
to senior management (see "Convertible Notes").   Additionally, it would be an
event of default if the Registrant were to undergo a change in control (as
defined in the Bank Agreement), merge or take similar action without
the consent of its secured and unsecured lenders (see "Bank Covenants" and
"Convertible Notes").  An individual stock option agreement with George H.
Wells provides that the Compensation Committee of the Board may accelerate the
unvested portion of options granted to him in August 1997 in the event of a
change in control, as defined in such agreement.  All stock option agreements
with officers and directors, including the August 1997 agreement with Mr.
Wells, provide for the acceleration of the exercise period upon a change in
control.

PREFERRED STOCK

     The Board of Directors has the authority, without any further vote or
action by the stockholders, to provide for the issuance of up to 1,000,000
shares of Preferred Stock from time to time in one or more series with such
designations, rights, preferences and limitations as the Board of Directors may
determine, including the consideration received therefor.  The Board also has
the authority to determine the number of shares comprising each series,
dividend rates, redemption provisions, liquidation preferences, sinking fund
provisions, conversion rights and voting rights without approval by the holders
of Common Stock.   The Board has exercised this authority to date only with
respect to the outstanding 70,000 shares of "Participating Preferred Stock."
The Participating Preferred Stock entitles the holder to participate in certain
amounts derived from a "net working interest" in an oil and gas exploration
property owned by a subsidiary of the Registrant, and has no rights to vote, to
receive dividends or liquidation payments, or any other rights.

                                      3
<PAGE>   3


CONVERTIBLE NOTES

     The Company currently has outstanding  $2,500,000 of 11% Convertible
Subordinated Notes due March 31, 2001 (the "Convertible Notes").  The
Convertible Notes are convertible at any time prior to full payment of the
principal in an amount determined by dividing the aggregate principal amount to
be converted by the purchase price then applicable to the Warrants (defined
below).   The Convertible Notes were issued pursuant to a Note and Warrant
Purchase Agreement dated as of February 29, 1996, effective March 8, 1996 (the
"Note Agreement"), which contains affirmative and negative covenants which
could adversely affect the rights of the holders of Common Stock. Unless
permitted in the Note Agreement, without the prior written consent of all 
holders of Convertible Notes, the Registrant may not take certain actions,
including paying a dividend, repurchase or issue its capital stock, incur debt
or suffer any mortgages or liens, dispose of or acquire any businesses or
engage in any new businesses, or adopt any new incentive stock option or
similar plan.  In conjunction with the Note Agreement, the Registrant also
executed a put agreement (the "Put Agreement") with the holders of the
Convertible Notes and Warrants,  which requires the Registrant to repurchase
the Warrants and securities issued upon conversion of the Convertible Notes
upon a Change in Control Event, as defined in the Put Agreement, and at any
time after the last day of the fifth anniversary of the Note Agreement, at a
purchase price equivalent to the greater of the Fair Market Value or the
Earnings Value of the Company, as defined in the Put Agreement.  Additionally,
shareholders of the Registrant who are also Board members of the Registrant
executed an Equity Holders Agreement pursuant to which the signatories agreed
to vote all their stock in favor of  the election and continuation in office of
a Board consisting of not less than eight and not more than nine members, one
of which is designated by First New England Capital Limited Partnership and one
of which is designated by MorAmerica Capital Corporation and North Dakota Small
Business Investment Company.

WARRANTS

      On March 8, 1996, the Company issued warrants for an aggregate of
1,250,000 shares of Common Stock, exercisable at a price of $2.00 per share
(the "Warrants"), and expiring on March 8, 2004.  The holders of the Warrants
are entitled to receive an adjustment in the number of shares as to which the
Warrant relates and the exercise price upon the occurrence of certain events,
including the issuance by the Registrant of equity securities at a price below
the then existing exercise price or if the Registrant takes any action
affecting its Common Stock which would have a material adverse effect upon the
Holder's rights.  As of August 15, 1997, the holders of the Warrants have
received warrants for 7,435 additional shares pursuant to the operation of the
foregoing provisions.  The holders of the Warrants also have the benefit of
agreements described above under "Convertible Notes."

BANK COVENANTS

     The Registrant's subsidiary, McInnes Steel Company and its subsidiaries,
is subject to a loan and security agreement with The Huntington National Bank
dated as of February 29, 1996 (the "Bank Agreement"), as amended, which is
guaranteed by the Registrant and certain of  the Registrant's other
subsidiaries.  The Bank Agreement contains certain negative covenants that
indirectly affect the holders of Common Stock by requiring the Registrant to
maintain various Net Worth and Fixed Charge Coverage Ratios, as those terms are
defined in the Bank Agreement.  The Bank Agreement also prohibits the
Registrant from paying dividends or making other distributions to the
Registrant's shareholders, from repurchasing the Registrant's capital stock,
from acquiring new businesses, or from taking various other actions without the
written consent of the Bank.  To secure the obligations under the Bank
Agreement, the Registrant (through its subsidiaries) has granted the Bank
mortgages and security interests in substantially all the real and personal
property of the Registrant and its subsidiaries.

REGISTRATION RIGHTS

     In connection with the issuance and sale of the Warrants and the
Convertible Notes, the Registrant entered into a registration rights agreement
with MorAmerica Capital Corporation, First New England Capital Limited
Partnership and North Dakota Small Business Investment Company.  Additionally,
in connection with Common Stock issued by the Registrant in the acquisition of
the assets now owned by Registrant's wholly-owned, indirect subsidiary Taylor
Forge Company, the Registrant entered into a registration rights agreement
(collectively, the "Registration Rights Agreements").   (The beneficiaries of
the Registration Rights Agreements are collectively called the "Holders.")
In the event that the Registrant files a registration statement for the
issuance and sale of its securities or the securities of other of its security
holders, the Registrant is obligated to give notice of the proposed filing of
such registration statement to the Holders, who may elect to cause all or a
portion of their securities to be included in such registration statement,
subject to reduction for 

                                      4
<PAGE>   4

market reasons.  In such event, the Registrant would be responsible for the
payment of the Holders' "registration expenses," but not their "selling
expenses," as those terms are defined in the Registration Rights        
Agreements.

LIMITATIONS ON DIRECTORS' LIABILITY

     The Certificate of Incorporation, as amended, limits the liability of
directors to the full extent permitted by Delaware law.   The Certificate of
Incorporation, as amended, provides that a director of the Registrant will not
be personally liable to the Registrant or its stockholders for monetary damages
for breach of their fiduciary duties as directors, except for (i) breach of 
the directors' duty of loyalty, (ii) acts or omissions not in good
faith or which involve intentional misconduct or a knowing violation of law,
(iii) the unlawful payment of a dividend or unlawful stock purchase or
redemption and (iv) any transaction from which a director derives any improper
personal benefit.  The limitation of damages does not eliminate equitable
remedies for any allegation of a director's violation of his duty of care, such
as injunction or rescission.

     These provisions will not limit liability under state or federal
securities laws.  The Registrant believes that these provisions will assist the
Registrant in attracting and retaining qualified individuals to serve as
directors.

TRANSFER AGENT AND REGISTRAR

     The Transfer Agent and Registrar of the Common Stock is Harris Trust and
Savings Bank.

BULLETIN BOARD

     The Common Stock is quoted on the Bulletin Board of the National
Association of Securities Dealers under the symbol "CIII."    The Registrant
intends in the near future to make application for listing its Common Stock on
a national securities exchange and/or a national securities association.

ITEM 2.  EXHIBITS.

     1.   Certificate of Incorporation, as amended (filed as Exhibit 3.1
          to the Company's Report on Form 10-K for the fiscal year ended March
          31, 1996, file number 0-9607, and incorporated herein by reference).

     2.   Bylaws (filed as Exhibit 3.2 to the Company's Report on Form
          10-K for the fiscal year ended March 31, 1996, file number 0-9607,
          and incorporated herein by reference).

     3.   Participating Preferred Agreement (filed as Exhibit 3.3 to the
          Company's Report on Form 10-K for the fiscal year ended March 31,
          1996, file number 0-9607, and incorporated herein by reference).

     4.   Note and Warrant Purchase Agreement dated as of February 29,
          1996 and effective as of March 8, 1996, by and among MorAmerica
          Capital Corporation, First New England Capital Limited Partnership,
          and North Dakota Small Business Investment Company and Centrum
          Industries, Inc. with respect to 11% convertible, subordinated notes
          and warrants for the purchase of 1,250,000 shares of the Company's
          common stock (filed as Exhibit 10.3 to the Company's Report on Form
          10-K for the fiscal year ended March 31, 1996, file number 0-9607,
          and incorporated herein by reference).

     5.   Common Stock Warrant dated as of February 29, 1996 and
          effective as of March 8, 1996, issued to MorAmerica Capital
          Corporation for 627,445 shares of common stock (filed as Exhibit 10.4
          to the Company's Report on Form 10-K for the fiscal year ended March
          31, 1996, file number 0-9607, and incorporated herein by reference).

     6.   Common Stock Warrant dated as of February 29, 1996 and
          effective as of March 8, 1996, issued to First New England Capital
          Limited Partnership for 375,000 shares of common stock (filed as
          Exhibit 10.5 to the Company's Report on Form 10-K for the fiscal year
          ended March 31, 1996, file number 0-9607, and incorporated herein by
          reference).

                                      5
<PAGE>   5


     7.   Common Stock Warrant dated as of February 29, 1996 and
          effective as of March 8, 1996, issued to North Dakota Small Business
          Investment Company for 247,555 shares of common stock (filed as
          Exhibit 10.6 to the Company's Report on Form 10-K for the fiscal year
          ended March 31, 1996, file number 0-9607, and incorporated herein by
          reference).

     8.   Put Agreement by and among MorAmerica Capital Corporation,
          First New England Capital Limited Partnership, and North Dakota Small
          Business Investment Company and Centrum Industries, Inc. (filed as
          Exhibit 10.7 to the Company's Report on Form 10-K for the fiscal year
          ended March 31, 1996, file number 0-9607, and incorporated herein by
          reference).

     9.   Equity Holders Agreement dated as of February 29, 1996,
          effective as of March 8, 1996, by and among First New England Capital
          Limited Partnership, MorAmerica Capital Corp., North Dakota Small
          Business Investment Company, Centrum Industries, Inc. and certain
          shareholders of Centrum Industries, Inc. (filed as Exhibit 9.1 to the
          Company's Report on Form 10-K for the fiscal year ended March 31,
          1996, file number 0-9607, and incorporated herein by reference).

     10.  Registration Rights Agreement dated as of February 29, 1996,
          effective as of March 8, 1996, by and among MorAmerica Capital
          Corporation, First New England Capital Limited Partnership and North
          Dakota Small Business Investment Company and Centrum Industries, Inc.
          (filed as Exhibit 10.8 to the Company's Report on Form 10-K for the
          fiscal year ended March 31, 1996, file number 0-9607, and
          incorporated herein by reference).

     11.  Registration Rights Agreement dated as of June 4, 1997 by and
          among Taylor Forge International, Inc. and Centrum Industries, Inc.
          (filed as Exhibit 10.2 to the Company's Report on Form 8-K on June
          19, 1997, file number 0-9607, and incorporated herein by reference).

     12.  Loan and Security Agreement dated as of February 29, 1996, by
          and among The Huntington National Bank and McInnes Steel Company,
          Eballoy Glass Products Company, Erie Bronze & Aluminum Company, and
          McInnes International, Inc. as Borrowers, and Centrum Industries,
          Inc. and McInnes Services, Inc. as Guarantors  (filed as Exhibit 10.9
          to the Company's Report on Form 10-K for the fiscal year ended March
          31, 1996, file number 0-9607, and incorporated herein by reference);
          Amendment No. 1 thereto dated January 1, 1997 (filed as Exhibit 10.29
          to the Company's Report on Form 10-K for the fiscal year ended March
          31, 1997, file number 0-9607, and incorporated herein by reference);
          and Amendment No. 2 thereto dated June 4, 1997 (filed as Exhibit 10.5
          to the Company's Report on Form 8-K on June 19, 1997, file number
          0-9607, and incorporated herein by reference).

     13.  The Specimen of the Registrant's common stock certificate is
          filed herewith.

     14.  The Common Stock Warrant dated as of July 21, 1997, issued to
          MorAmerica Capital Corporation for 3,732 shares of common stock is
          filed herewith.

     15.  The Common Stock Warrant dated as of July 21, 1997, issued to
          North Dakota Small Business Investment Company for 1,472 shares of
          common stock is filed herewith.

     16.  The Common Stock Warrant dated as of August 1, 1997 issued to
          First New England Capital Limited Partnership for 2,231 shares of
          common stock is filed herewith.






                                      6

<PAGE>   6




                                   SIGNATURE

     Pursuant to the requirements of Section 12 of the Securities Exchange Act
of 1934, the Registrant has duly caused this Amended Registration Statement to
be signed on its behalf by the undersigned, thereto duly authorized.


                                CENTRUM INDUSTRIES, INC.
                                (Registrant)

                                By: /s/ George H. Wells
                                    --------------------------------------
                                    George H. Wells, Chairman of the Board,
                                    Chief Executive Officer, and President
        
                                Dated:   August 26, 1997


                                      7

<PAGE>   7


                                 EXHIBIT INDEX

1.   Certificate of Incorporation, as amended (filed as Exhibit 3.1 to the
     Company's Report on Form 10-K for the fiscal year ended March 31, 1996,
     file number 0-9607, and incorporated herein by reference).

2.   Bylaws (filed as Exhibit 3.2 to the Company's Report on Form 10-K for the
     fiscal year ended March 31, 1996, file number 0-9607, and incorporated
     herein by reference).

3.   Participating Preferred Agreement (filed as Exhibit 3.3 to the Company's
     Report on Form 10-K for the fiscal year ended March 31, 1996, file number
     0-9607, and incorporated herein by reference).

4.   Note and Warrant Purchase Agreement dated as of February 29, 1996 and
     effective as of March 8, 1996, by and among MorAmerica Capital
     Corporation, First New England Capital Limited Partnership, and North
     Dakota Small Business Investment Company and Centrum Industries, Inc. with
     respect to 11% convertible, subordinated notes and warrants for the
     purchase of 1,250,000 shares of the Company's common stock (filed as
     Exhibit 10.3 to the Company's Report on Form 10-K for the fiscal year
     ended March 31, 1996, file number 0-9607, and incorporated herein by
     reference).

5.   Common Stock Warrant dated as of February 29, 1996 and effective as of
     March 8, 1996, issued to MorAmerica Capital Corporation for 627,445 shares
     of common stock (filed as Exhibit 10.4 to the Company's Report on Form
     10-K for the fiscal year ended March 31, 1996, file number 0-9607, and
     incorporated herein by reference).

6.   Common Stock Warrant dated as of February 29, 1996 and effective as of
     March 8, 1996, issued to First New England Capital Limited Partnership for
     375,000 shares of common stock (filed as Exhibit 10.5 to the Company's
     Report on Form 10-K for the fiscal year ended March 31, 1996, file number
     0-9607, and incorporated herein by reference).

7.   Common Stock Warrant dated as of February 29, 1996 and effective as of
     March 8, 1996, issued to First New England Capital Limited Partnership and
     North Dakota Small Business Investment Company for 247,555 shares of
     common stock (filed as Exhibit 10.6 to the Company's Report on Form 10-K
     for the fiscal year ended March 31, 1996, file number 0-9607, and
     incorporated herein by reference).

8.   Put Agreement by and among MorAmerica Capital Corporation, First New
     England Capital Limited Partnership, and North Dakota Small Business
     Investment Company and Centrum Industries, Inc. (filed as Exhibit 10.7 to
     the Company's Report on Form 10-K for the fiscal year ended March 31,
     1996, file number 0-9607, and incorporated herein by reference).

9.   Equity Holders Agreement dated as of February 29, 1996, effective as of
     March 8, 1996, by and among First New England Capital Limited Partnership,
     MorAmerica Capital Corp., North Dakota Small Business Investment Company,
     Centrum Industries, Inc. and certain shareholders of Centrum Industries,
     Inc. (filed as Exhibit 9.1 to the Company's Report on Form 10-K for the
     fiscal year ended March 31, 1996, file number 0-9607, and incorporated
     herein by reference).

10.  Registration Rights Agreement dated as of February 29, 1996, effective as
     of March 8, 1996, by and among MorAmerica Capital Corporation, First New
     England Capital Limited Partnership and North Dakota Small Business
     Investment Company and Centrum Industries, Inc. (filed as Exhibit 10.8 to
     the Company's Report on Form 10-K for the fiscal year ended March 31,
     1996, file number 0-9607, and incorporated herein by reference).

11.  Registration Rights Agreement dated as of June 4, 1997 by and among
     Taylor Forge International, Inc. and Centrum Industries, Inc. (filed as
     Exhibit 10.2 to the Company's Report on Form 8-K on June 19, 1997, file
     number 0-9607, and incorporated herein by reference).

12.  Loan and Security Agreement dated as of February 29, 1996, by and among
     The Huntington National Bank and McInnes Steel Company, Eballoy Glass
     Products Company, Erie Bronze & Aluminum Company, and McInnes
     International, Inc. as Borrowers, and Centrum Industries, Inc. and McInnes
     Services, Inc. as Guarantors  (filed as Exhibit 10.9 to the Company's
     Report on Form 10-K for the fiscal year ended March 31, 1996, file number
     0-9607, and incorporated herein by reference); Amendment No. 1 thereto
     dated January 1, 1997 (filed as Exhibit 10.29 to the 


                                      8
<PAGE>   8


       Company's Report on Form 10-K for the fiscal year ended March 31, 1997,
       file number 0-9607, and incorporated herein by reference); and Amendment
       No. 2 thereto dated June 4, 1997 (filed as Exhibit 10.5 to the Company's
       Report on Form 8-K on June 19, 1997, file number 0-9607, and
       incorporated herein by reference).

4.13.  The Specimen of the Registrant's common stock certificate is filed
       herewith.

4.14.  The Common Stock Warrant dated as of July 21, 1997, issued to MorAmerica
       Capital Corporation for 3,732 shares of common stock is filed herewith.

4.15.  The Common Stock Warrant dated as of July 21, 1997, issued to North 
       Dakota Small Business Investment Company for 1,472 shares of common
       stock is filed herewith.

4.16.  The Common Stock Warrant dated as of August 1, 1997, issued to First New
       England Capital Limited Partnership for 2,231 shares of common stock is 
       filed  herewith.





                                      9

<PAGE>   1
                                                                    EXHIBIT 4.13

<TABLE>
<S><C>
                      COMMON                           [GRAPHIC]                                                  COMMON
                      NUMBER                                                                                      SHARES
                     SM  3923                                                                                    SPECIMEN



THIS CERTIFICATE IS TRANSFERABLE                   
      EITHER IN CHICAGO, IL .                     CENTRUM INDUSTRIES, INC.
      OR IN NEW YORK, N.Y.

                                INCORPORATED UNDER THE LAWS OF THE STATE OF NORTH DAKOTA                  CUSIP  15640H 10 6

           See reverse for certain definitions

         THIS CERTIFIES THAT                                                                                      is the owner of


                                                             SPECIMEN

                FULLY PAID AND NONASSESSABLE SHARES, OF THE PAR VALUE OF FIVE CENTS ($.05) EACH OF THE COMMON STOCK OF
                                                                                                            
                         -----------------------                           -----------------------------               Countersigned
                ----------------------------------CENTRUM INDUSTRIES, INC.---------------------------------------          and      
                         -----------------------                           -----------------------------                 Registered 
                (hereinafter called the "Corporation") transferable on the books of the Corporation by the holder    HARRIS TRUST   
                hereof in person, or by duly authorized attorney, upon the surrender of this Certificate properly        AND SAVINGS
                endorsed.  This certificate is not valid until countersigned by the Transfer Agent and registered         BANK      
                by the Registrar.                                            
                     WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly          By ____________
                authorized officers.                   
                                                                                                                     Auth. Sig.

                                                                                                                     TRANSFER AGENT
                                                                                                                     & REGISTRAR


                Dated:
             
            [SIG]                       Chairman                                                                      [SIG]
                                                                  [SEAL]                                             PRESIDENT
</TABLE>

<PAGE>   2
<TABLE>
<S><C>
        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:

                                                                     UNIF GIFT MIN ACT - ............. Custodian ..............
TEN COM      -as tenants in common                                                           (Cust)                 (Minor)
TEN ENT      -as tenants by the entireties                                                   under Uniform Gifts to Min.
JT TEN       -as joint tenants with right of                                                 
               survivorship and not as tenants                                               Act...........................
               in common                                                                                 (State)
               Additional abbreviations may also be used though not in the above list.

For value received _______ hereby sell, assign and transfer unto

PLEASE INSERT SOCIAL SECURITY OR OTHER
    IDENTIFIYING NUMBER OF ASSIGNEE
 _________________________
|                         |
|_________________________|_________________________________________________________________________________

____________________________________________________________________________________________________________
                                    PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS OF ASSIGNEE
____________________________________________________________________________________________________________

____________________________________________________________________________________________________________

_______________________________________________________________________________________________________ Shares
of the capital stock represented by the within Certificate; and do hereby irrevocably constitute and appoint
_______________________________________________________________________________________________________ Attorney
to transfer the said stock on the books of the within-named Corporation with full power of substitution in the
premises.


Dated                                                       ________________________________________________

                                                            ________________________________________________
                                                            NOTICE: THE SIGNATURE TO THIS ASSIGNMENT MUST 
                                                            CORRESPOND WITH THE NAME AS WRITTEN UPON THE 
                                                            FACE OF THE CERTIFICATE IN EVENT PARTICULAR WITHOUT
                                                            ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.
</TABLE>

SIGNATURE GUARANTEED

<PAGE>   1
                                                                    EXHIBIT 4.14

                              COMMON STOCK WARRANT

July 21, 1997

NEITHER THIS WARRANT, NOR THE STOCK TO BE ISSUED UPON EXERCISE HEREOF, HAS BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 SECURITIES
ACT"), OR QUALIFIED OR REGISTERED UNDER ANY STATE SECURITIES LAWS (THE "STATE
SECURITIES LAWS"), AND THIS WARRANT HAS BEEN, AND THE COMMON STOCK TO BE ISSUED
UPON EXERCISE HEREOF WILL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO,
OR FOR RESALE IN CONNECTION WITH, ANY DISTRIBUTION THEREOF.  NO SUCH SALE OR
OTHER DISPOSITION MAY BE MADE WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER
THE 1933 SECURITIES ACT AND COMPLIANCE WITH THE APPLICABLE STATE SECURITIES
LAWS, OR AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO THE ISSUER AND ITS
COUNSEL, THAT SAID REGISTRATION IS NOT REQUIRED UNDER THE 1933 SECURITIES ACT
AND THAT APPLICABLE STATE SECURITIES LAWS HAVE BEEN COMPLIED WITH.

                                    WARRANT

                            Void after March 8, 2004

No. 4                                           Warrant to Purchase Common Stock
                                                          $.05 Par Value

         This certifies that MORAMERICA CAPITAL CORPORATION ("Purchaser"),
having an address of c/o InvestAmerica Investment Advisors, Inc., 101 2nd
Street S.E., Suite 800, Cedar Rapids, Iowa 52401, or any party to whom this
Warrant is assigned in compliance with the terms hereof (Purchaser and any such
assignee being hereafter sometimes referred to as "Holder"), is entitled to
subscribe to and purchase, (i) during the period commencing at the date first
set forth above and ending at 5 p.m. Toledo, Ohio local time, on the
"Expiration Date" (as defined below), THREE THOUSAND AND SEVEN HUNDRED THIRTY
TWO (3,732) shares of fully paid and nonassessable Common Stock (as hereinafter
defined of CENTRUM INDUSTRIES, INC. (the "Company"), a Delaware corporation
with its principal place of business at 6135 Trust Drive, Suite 104A, Holland,
Ohio 43528.  This Warrant is one of a series of Warrants identical in form
issued by the Company pursuant to the Agreement (as defined below), and the
Holder, by acceptance hereof, agrees to be bound by the provisions of such
Agreement as applicable to this Warrant.  The purchase price of each such share
of Common Stock shall be the Warrant Price as defined below.  This Warrant was
originally issued to Purchaser pursuant to the Agreement (as defined below).
<PAGE>   2

                                   ARTICLE I
                                  DEFINITIONS

1.1      "Aggregate Price" shall mean the product, at any time of reference, of
         (i) the Warrant Price multiplied by (ii) the number of shares of
         Warrant Stock.

1.2      "Agreement" shall mean that certain Note and Warrant Purchase
         Agreement entered into by and between Purchaser, among others, and the
         Company of even date herewith.

1.3      "Common Stock" shall mean and include the Company's common stock, par
         value $.05, as constituted on the date hereof, and shall also include
         any capital stock of any class or series of the Company's hereafter
         authorized which shall substitute for or replace the Common Stock as
         constituted on the date hereof; provided, however, that in the event
         the Company authorizes one or more classes or series of capital stock
         qualifying as "Common Stock" for purposes of the foregoing definition,
         in addition to the class of authorized capital stock denominated as
         "Common Stock" in the Company's Certificate of Incorporation as of the
         date hereof, the Holder shall have the right to designate at each time
         it exercises its rights hereunder the class or series of authorized
         capital stock that it elects to purchase in satisfaction of its rights
         hereunder.

1.4      "Common Stock Equivalents" shall mean Convertible Securities and
         Rights.

1.5      "Convertible Securities" means any securities which are directly or
         indirectly convertible into Common Stock.

1.6      "Effective Price" means the quotient obtained by dividing (i) Minimum
         Consideration by (ii) Maximum Shares Upon Exercise.

1.7      "Expiration Date" means March 8, 2004.

1.8      "Maximum Shares Upon Exercise" means the maximum number of shares of
         Common Stock issuable under a Common Stock Equivalent upon complete
         exercise and full conversion of all Rights or Convertible Securities
         represented thereby, computed without regard to contingent adjustments
         to the number of shares issuable upon exercise and conversion.

1.9      "Minimum Consideration" means the minimum aggregate consideration paid
         or payable at any time for the purchase of the Common Stock
         Equivalents during the term of the Common Stock Equivalents, and upon
         complete exercise and full conversion of the Common Stock Equivalents,
         computed without regard to contingent adjustments to  exercise or
         conversion price.





                                       2
<PAGE>   3

1.10     "Notes" means the Company's 11% Convertible Subordinated Notes due
         March 31,  2001, one or more of which has been issued by the Company
         on the date hereof to the  Purchaser, among others, together with any
         note issued in exchange therefor or  replacement thereof.

1.11     "Rights" means any options, warrants, or rights to purchase Common
         Stock or  Convertible Securities.

1.12     "Warrant Price" shall mean Two and 00/100 ($2.00) Dollars for each
         share of Common  Stock subject, however, to reduction pursuant to
         Section 3.5 hereof.

1.13     "Warrant Stock" shall mean 3,732 shares of Common Stock, subject to
         reduction as  provided in Section 2.2 hereof.


                                   ARTICLE II
                              EXERCISE AND PAYMENT

2.1      Cash Exercise.  The purchase rights represented by this Warrant may be
         exercised by  Holder, in whole or in part, by written notice of
         exercise delivered to the Company at  least twenty (20) days prior to
         the intended date of exercise and by the surrender of this Warrant at
         the principal office of the Company, and by the payment to the
         Company, by  certified, cashier's or other check acceptable to the
         Company, of an amount equal to the  aggregate Warrant Price of the
         shares being purchased.

2.2      Deemed Exercise Upon Conversion of Notes.  In lieu of exercising this
         Warrant pursuant  to Section 2.1, Holder may elect to convert all or a
         portion of the outstanding principal  balance of any of the Notes into
         shares of Common Stock at a conversion price equal to  the Warrant
         Price pursuant to the terms of such Note, in which event this Warrant
         shall  be deemed, without further act or instrument, to have been
         exercised for a number of  shares of Common Stock equal to the number
         of shares of Common Stock received by  the Purchaser upon such
         conversion, and the number of shares of Warrant Stock subject  to this
         Warrant shall be reduced by an equal number of shares, and this
         Warrant shall  remain in full force and effect with respect to such
         reduced number of shares of Warrant Stock. The foregoing conversion
         shall be effected by delivery of a written notice to the  Company at
         least twenty (20) days prior to the intended date of conversion
         specifying the  amount of outstanding principal to be converted. By
         way of example and illustration  only, if the Purchaser elects to
         convert $100 of the outstanding principal balance of a Note and
         receives 50 shares of Common Stock upon such conversion, the number of
         shares of Warrant Stock subject to this Warrant shall be reduced from
         3,732 to 3,682 and this Warrant shall remain in full force and effect
         with respect to such 3,682 shares of Warrant Stock.





                                       3
<PAGE>   4

2.3      Stock Certificate.  In the event of any exercise of the rights
         represented by this Warrant, certificates for the shares of Common
         Stock so purchased shall be delivered to Holder within a reasonable
         time and, unless this Warrant has been fully exercised or has expired,
         a new Warrant representing the number of shares of Common Stock with
         respect to which this Warrant shall not have been exercised shall also
         be issued to Holder within such time.

2.4      Stock Fully Paid; Reservation of Shares.  The Company covenants and
         agrees that all Common Stock which may be issued upon the exercise of
         the rights represented by this Warrant will, upon issuance, be fully
         paid and nonassessable and free from all taxes, liens and charges with
         respect to the issue thereof (excluding taxes based on the income of
         Holder), provided that any such shares of Common Stock shall be
         subject to the restrictions, obligations and duties imposed upon
         stockholders of the Company pursuant to that certain Equity Holders'
         Agreement, of even date herewith, among the Company and the Purchaser,
         among others, as the same may be amended and supplemented to and
         including the date hereof (the "Equity Holders' Agreement"), and shall
         be subject to applicable restrictions imposed by relevant federal and
         state securities laws relating to capital stock sold in a private
         placement. The Company further covenants and agrees that during the
         period within which the rights represented by this Warrant may be
         exercised, the Company will at all times have authorized and reserved
         for issuance a sufficient number of shares of its Common Stock as
         would be required upon the full exercise of the rights represented by
         this Warrant.

2.5      Fractional Shares.  No fractional share of Common Stock will be issued
         in connection with any exercise hereof, but in lieu of a fractional
         share upon complete exercise hereof, Holder may purchase a whole share
         at the then effective Warrant Price.


                                  ARTICLE III
                        CERTAIN ADJUSTMENTS OF NUMBER OF
                      SHARES PURCHASABLE AND WARRANT PRICE

         The number and kind of securities purchasable upon the exercise of
this Warrant and the Warrant Price shall be subject to adjustment from time to
time upon the occurrence of certain events, as follows:

3.1      Reclassification, Consolidation or Merger.  In case of: (i) any
         reclassification or change of outstanding securities issuable upon
         exercise of this Warrant; (ii) any consolidation or merger of the
         Company with or into another corporation (other than a merger with
         another corporation in which the Company is a continuing corporation
         and which does not result in any reclassification, change or exchange
         of outstanding securities issuable





                                       4
<PAGE>   5

         upon exercise of this Warrant); or (iii) any sale or transfer to
         another corporation of all, or substantially all, of the property of
         the Company, then, and in each such event, the Company or such
         successor or purchasing corporation, as the case may be, shall execute
         a new Warrant which will provide that Holder shall have the right to
         exercise such new Warrant and purchase upon such exercise, in lieu of
         each share of Common Stock theretofore issuable upon exercise of this
         Warrant, the kind and amount of securities, money and property
         receivable upon such reclassification, change, consolidation, merger,
         sale or transfer by a holder of one share of Common Stock issuable
         upon exercise of this Warrant had this Warrant been exercised
         immediately prior to such reclassification, change, consolidation,
         merger, sale or transfer. Such new Warrant shall provide for
         adjustments which shall be as nearly equivalent as may be practicable
         to the adjustments provided in this Section 3 and the provisions of
         this Section 3.1, shall similarly apply to successive
         reclassifications, changes, consolidations, mergers, sales and
         transfers.

3.2      Subdivision or Combination of Shares.  If the Company shall at any
         time while this Warrant remains outstanding and unexercised in whole
         or in part: (i) divide its Common Stock, the Warrant Price shall be
         proportionately reduced; or (ii) combine shares of is Common Stock,
         the Warrant Price shall be proportionately increased.

3.3      Adjustment for Issue or Sale of Shares at Less Than the Warrant Price.
         If, in a transaction other than an issuance excepted from these
         provisions as set forth below or an issuance that causes an adjustment
         under Sections 3.1 or 3.2, the Company shall at any time or from time
         to time, issue any additional shares of Common Stock without
         consideration or for a net consideration per share less than the
         Warrant Price in effect immediately prior to such issuance, then, and
         in each case, the Warrant Price shall be lowered to an amount equal to
         the lowest per share price received, or deemed received, by the
         Company as consideration for such Shares.

         For purposes of this Section 3.3:

                 (i)      There shall be no adjustment under this Section 3.3
                          for any sales or issuances: (a) in a transaction in
                          which an adjustment will be made pursuant to Section
                          3.1 or 3.2; or (b) pursuant to that certain
                          Confidential Private Placement Memorandum of the
                          Company dated November 15, 1995 for the sale of up to
                          2,400,000 shares of the Company's common stock at a
                          price of $1.50 per share; or (c) upon the Company's
                          granting to George Wells, no later than ninety (90)
                          days after March 31, 1996 fiscal year at the
                          discretion of the Company's Board of Directors, based
                          upon satisfaction of certain incentive goals, an
                          option or options to purchase up to 150,000 shares of
                          the Company's common stock at a price of $1.50 per
                          share;





                                       5
<PAGE>   6

                 (ii)     The issuance of Common Stock Equivalents shall be
                          deemed an issuance  at such time of the shares of
                          Common Stock underlying the Common Stock Equivalents.
                          If the Effective Price shall be less than the Warrant
                          Price at the time of such issuance, then an
                          adjustment in the Warrant Price shall be made upon
                          each such issuance in the manner provided in this
                          Section 3.3. No adjustment of the Warrant Price shall
                          be made under this Section 3.3 upon the issuance of
                          shares of Common Stock upon the exercise or
                          conversion of Common Stock Equivalents if an
                          adjustment has previously been made as above
                          provided. Any adjustment of the Warrant Price shall
                          be disregarded, if, as and when such Common Stock
                          Equivalents expire or are cancelled without being
                          exercised so that the Warrant Price effective
                          immediately upon such cancellation or expiration
                          shall be equal to the Warrant Price in effect at the
                          time of the issuance of the expired or cancelled
                          Common Stock Equivalents, with such additional
                          adjustments as would have been made to the Warrant
                          Price had the expired or cancelled Common Stock);
                          Equivalents not been issued.

3.4      Other Action Affecting Common Stock.  (a) If the Company takes any
         action affecting its Common Stock after the date hereof (including
         dividends and distributions), other than an action described in any of
         Sections 3.1 and 3.2 hereof, which would have a material adverse
         effect upon Holder's rights hereunder, the Warrant Price shall be
         adjusted downward in such manner and at such time as the Board of
         Directors of the Company shall in good faith determine to be equitable
         under the circumstances.

                 (b)      In case the Company shall make any distribution of
         its assets to holders of its Common Stock as a liquidation or partial
         liquidation dividend or by ways of return of capital, or other than as
         a dividend payable out of earnings or surplus legally available for
         dividends under the laws of the state of incorporation of the Company,
         and Holder exercises this Warrant within thirty (30) days after the
         later of (i) the record date for the determination of the holders of
         Common Stock entitled to such distribution of assets and (ii) the date
         upon which notice of such distribution is delivered by the Company to
         Holder, Holder shall be entitled to receive, for no additional
         consideration, in addition to the Warrant Stock, the amount of such
         assets (or, at the option of the Company. a sum equal to the value
         thereof at the time of such distribution, such value to be determined
         by the Board of Directors of the Company in good faith) that would
         have been payable to the Holder had it been the holder of record of
         the Warrant Stock on such record date.

                 (c)      In case the Company shall liquidate or wind up its
         affairs, the Holder shall be entitled, upon the exercise hereof, to
         receive, in lieu of the shares of Warrant Stock; that the Holder would
         have been entitled to receive, the same kind and amount of assets as
         would have been issued, paid or otherwise distributed to the Holder
         upon such dissolution, liquidation or winding up with respect to such
         shares of Warrant Stock, had





                                       6
<PAGE>   7

         the Holder been the holder of record of such shares of Warrant Stock
         on the record date for the determination of those entitled to receive
         any such distribution; provided, however, that all rights under this
         Warrant shall terminate on a date fixed by the Company, such date to
         be not earlier than the date of commencement of proceedings for
         dissolution, liquidation or winding up and not later than thirty (30)
         days after such date of commencement, unless the Holder shall have,
         prior to such termination date, exercised this Warrant.  Written
         notice of such termination of rights under this Warrant shall be given
         to the Holder at least thirty (30) days prior to such termination
         date.

3.5      Time of Adjustments to the Warrant Price.  All adjustments to the
         Warrant Price and the number of shares purchasable hereunder, unless
         otherwise specified herein, shall be effective as of the earlier of:

         (i)              the date of issue (or date of sale, if earlier) of
                          the security causing the adjustment;

         (ii)             the effective date of a division or combination of
                          shares;

         (iii)            the record date of any action of holders of the
                          Company's capital stock of any class taken for the
                          purpose of dividing or combining shares or entitling
                          shareholders to receive a distribution or dividends.

3.6      Notice of Adjustments.  In each case of an adjustment in the Warrant
         Price and the number of shares purchasable hereunder, the Company, at
         its expense, shall cause the Treasurer or chief financial officer of
         the Company to compute such adjustment and prepare a certificate
         setting forth such adjustment and showing in detail the facts upon
         which such adjustment is based. The Company shall promptly mail a copy
         of each such certificate to Holder pursuant to Section 6.9 hereof.

3.7      Duration of Adjusted Warrant Price.  Following each adjustment of the
         Warrant Price such adjusted Warrant Price shall remain in effect until
         a further adjustment of the Warrant Price.

3.8      Adjustment of Number of Shares.  Upon each adjustment of the Warrant
         Price pursuant to this Section 3, the number of shares of Warrant
         Stock shall be adjusted to the nearest whole share, to the number
         obtained by dividing the Aggregate Price by the Warrant Price as
         adjusted.





                                       7
<PAGE>   8

                                   ARTICLE IV
                          TRANSFER, EXCHANGE AND LOSS

4.1      Transfer.  This Warrant is transferable on the books of the Company at
         its principal office by the registered Holder hereof upon surrender of
         this Warrant properly endorsed, subject to compliance with federal and
         state securities laws. The Company shall issue and deliver to the
         transferee a new Warrant or Warrants representing the Warrants so
         transferred. Upon any partial transfer, the Company will issue and
         deliver to Holder a new Warrant or Warrants with respect to the
         Warrants not so transferred. Notwithstanding the foregoing, Holder
         shall not be entitled to transfer a number of shares or an interest in
         this Warrant representing less than five percent (5%) of the aggregate
         shares initially covered by this Warrant. Any transferee shall be
         subject to the same restrictions on transfer with respect to this
         Warrant as the Purchaser.

4.9      Securities Laws.  Upon any issuance of shares of Common Stock upon
         exercise of this  warrant, it shall be the Company's responsibility to
         comply with the requirements of:  (1) the 1933 Securities Act; (2) the
         Securities Exchange Act of 1934, as amended; (3)  any applicable
         listing requirements of any national securities exchange; (4) any
         state  securities regulation or "Blue Sky" laws; and (5) requirements
         under any other law or  regulation applicable to the issuance or
         transfer of such shares.  If required by the  Company, in connection
         with each issuance of shares of Common Stock upon exercise  of this
         Warrant, the Holder will give: (i) assurances in writing, satisfactory
         to the  Company, that such shares are not being purchased with a view
         to the distribution thereof  in violation of applicable laws, (ii)
         sufficient information, in writing, to enable the  Company to rely on
         exemptions from the registration or qualification requirements of
         applicable laws, if available, with respect to such exercise, (iii)
         the legal opinion required  by the restrictive legend set forth at the
         beginning of this Warrant, and (iv) its  cooperation to the Company in
         connection with such compliance.

4.3      Exchange.  Subject to compliance with applicable federal and state
         securities laws, this  Warrant is exchangeable at the principal office
         of the Company for Warrants to purchase  the same number of shares of
         Common Stock purchasable hereunder, each new Warrant  to represent the
         right to purchase such number of shares of Common Stock as Holder
         shall designate at the time of such exchange.  Each new Warrant shall
         be identical in  form and content to this Warrant, except for
         appropriate changes in the number of shares  of Common Stock covered
         thereby, the aggregate purchase price of such shares, the  percentage
         stated in Section 4.1 above, and any other changes which are necessary
         in order to prevent the Warrant exchange from changing the respective
         rights and obligations of the Company and the Holder as they existed
         immediately prior to such exchange.





                                       8
<PAGE>   9

4.4      Loss or Mutilation.  Upon receipt by the Company of evidence
         satisfactory to it of the ownership of, and the loss, theft,
         destruction or mutilation of, this Warrant and (in the case of loss,
         theft, or destruction) of indemnity satisfactory to it, and (in the
         case of mutilation) upon surrender and cancellation hereof, the
         Company will execute and deliver in lieu hereof a new Warrant.


                                   ARTICLE V
                                 HOLDER RIGHTS

5.1      No Shareholder Rights Until Exercise.  No Holder hereof, solely by
         virtue hereof, shall be entitled to any rights as a shareholder of the
         Company.  Holder shall have all rights of a shareholder with respect
         to securities purchased upon exercise hereof at the time of cash or
         deemed exercise pursuant to Sections 2.1 and 2.2 hereof.

5.2      Registration Rights.  The Company agrees that any shares of Common
         Stock issued to Holder upon exercise of this Warrant shall be subject
         to the registration rights set forth in the Registration Rights
         Agreement of even date herewith among the Company, the Purchaser and
         others.





                                   ARTICLE VI
                                 MISCELLANEOUS

6.1      Additional Covenants by the Company.  The Company further covenants
         and agrees that it will:

                 a.       Give each Holder prompt written notice of any
                          intended changes to the composition of its capital
                          structure, whether by issuance of new securities or
                          otherwise;

                 b.       Give each Holder written notice of any shareholders'
                          meeting and will allow a representative of each
                          Holder to attend such meetings;

                 c.       Give each Holder at least five days' prior written
                          notice of any action that the Company intends to take
                          by shareholders' written consent;





                                       9
<PAGE>   10

                 d.       Allow, upon reasonable notice and at reasonable
                          times, the inspection of its minute book and other
                          corporate records by a representative of the Holder;
                          and

                 e.       Not engage, other than on arm's length terms, in any
                          transaction with any of its shareholders or
                          affiliates (as such term is defined under Rule 144
                          issued by the Securities and Exchange Commission
                          under the 1933 Securities Act, as amended).

6.2      Governmental Approvals.  The Company will from time to time take all
         action which may be necessary to obtain and keep effective any and all
         permits, consents and approvals of governmental agencies and
         authorities and securities acts filings under federal and state laws,
         which may be or become requisite in connection with the issuance,
         sale, and delivery of this Warrant, and the issuance. sale and
         delivery of the shares of Common Stock or other securities or property
         issuable or deliverable upon exercise of this Warrant.

6.1      Governing Laws.  It is the intention of the parties hereto that except
         as set forth below, the internal laws of the State of Connecticut,
         U.S.A. (irrespective of its choice of law principles) shall govern the
         validity of this warrant, the construction of its terms. and the
         interpretation and enforcement of the rights and duties of the parties
         hereto, provided that the corporation laws of the State of Delaware
         shall govern the procedural and substantive matters pertaining to the
         due authorization, issuance, delivery and exercise of this Warrant and
         the shares of Common Stock upon exercise hereof. Except as set forth
         below, the parties hereby agree that any suit to enforce any provision
         of this Warrant arising out of or based upon this Warrant or the
         business relationship between any of the parties hereto shall be
         brought in the United States District Court for the District of
         Delaware or the courts of the State of Delaware located in Wilmington,
         Delaware.  Each party hereby agrees that such courts shall have
         personal jurisdiction and venue with respect to such party, and each
         party hereby submits to the personal jurisdiction and venue of such
         courts. In addition to the foregoing jurisdiction, Holder at its sole
         option, may commence any such suit in any jurisdiction in which the
         Company has a business office or is incorporated.

6.4      Binding Upon Successors and Assigns.  Subject to, and unless otherwise
         provided in, this Warrant, each and all of the covenants, terms
         provisions, and agreements contained herein shall be binding upon, and
         inure to the benefit of the permitted successors. executors, heirs,
         representatives, administrators and assigns of the parties hereto.

6.5      Severability.  If any one or more provisions of this Warrant, or the
         application thereof, shall for any reason and to any extent be invalid
         or unenforceable, the remainder of this Warrant and the application of
         such provisions to other persons or circumstances shall be





                                       10
<PAGE>   11

         interpreted so as best to reasonably effect the intent of the parties
         hereto. The parties further agree to replace any such void or
         unenforceable provisions of this Warrant with valid and enforceable
         provisions which will achieve, to the extent possible, the economic,
         business and other purposes of the void or unenforceable provisions.

6.6      Default, Amendment and Waivers.  This Warrant may be amended upon the
         written consent of the Company and the Holder. The waiver by a party
         of any breach hereof for default in payment of any amount due
         hereunder or default in the performance hereof shall not be deemed to
         constitute a waiver of any other default or any succeeding breach or
         default. It shall be an event of default under this Warrant if the
         Company breaches any term or condition hereof or fails to perform any
         obligation as and when required hereunder and such breach or failure
         is not cured within thirty (30) days after receiving written notice
         thereof from Holder. Upon such event of default, the Warrant Price for
         all shares shall be reduced by one-fifth and thereafter shall continue
         to be reduced by one-fifth from the then adjusted Warrant Price for
         each successive thirty (30) day period in which such breach is not
         cured.

6.7      No Waiver. The failure of any party to enforce any of the provisions
         hereof shall not  be construed to be a waiver of the right of such
         party thereafter to enforce such  provisions.

6.8      Attorneys' Fees.  Should suit be brought to enforce or interpret any
         part of this Warrant,  the prevailing party shall be entitled to
         recover, as an element of the costs of suit and not  as damages,
         reasonable attorneys fees to be fixed by the court (including without
         limitation, costs, expenses and fees on any appeal). The prevailing
         party shall be the  party entitle to recover its costs of suit,
         regardless of whether such suit proceeds to final  judgment. A party
         not entitled to recover its costs shall not be entitled to recover
         attorneys' fees. No sum for attorneys' fees shall be counted in
         calculating the amount  of a judgment for purposes of determining if a
         party is entitled to recover costs or  attorneys' fees.

6.9      Notices.  Whenever any party hereto desires or is required to give any
         notices, demand, or request with respect to this Warrant, each such
         communication shall be in writing and  shall be effective only if it
         is delivered by personal service or delivered by a nationally
         recognized overnight courier, in each case addressed to the parties
         hereto at their  respective addresses set forth at the beginning of
         this Agreement. Such communication  shall be effective when they are
         received by the addressee thereof. Any party may  change its address
         for such communications by giving notice thereof to the other party
         in conformity with this Section.

6.10     Time.  Time is of the essence of this Warrant.





                                       11
<PAGE>   12

6.11     Construction of Agreement.  This Warrant has been negotiated by the
         respective parties hereto and their attorneys and the language hereof
         shall not be construed for or against any party.

6.12     No Endorsement.  Holder understands that no federal or state
         securities administrator has made any finding or determination
         relating to the fairness of investment in the Company or purchase of
         the Common Stock hereunder and that no federal or state securities
         administrator has recommended or endorsed the offering of securities
         by the Company hereunder.

6.13     Pronouns.  All pronouns and any variations thereof shall be deemed to
         refer to the masculine, feminine or neuter, singular or plural, as the
         identity of the person, persons, entity or entities may require.

6.14     Further Assurances.  Each party agrees to cooperate fully with the
         other parties and to execute such further instruments, documents and
         agreements and to give such further written assurances, as may be
         reasonably requested by any other party to better evidence and reflect
         the transactions described herein and contemplated hereby, and to
         carry into effect the intents and purposes of this Warrant.




         IN WITNESS WHEREOF, the undersigned Company has caused this Common
Stock Warrant to be executed and delivered on the date first above written by
its President, thereunto duly authorized.


                                        COMPANY:

                                        Centrum Industries, Inc.



                                   By:  /s/ George H. Wells
                                        ----------------------------
                                        George Wells
                                        Its President





                                       12

<PAGE>   1
                                                                    EXHIBIT 4.15
                              COMMON STOCK WARRANT

July 21, 1997

NEITHER THIS WARRANT, NOR THE STOCK TO BE ISSUED UPON EXERCISE HEREOF, HAS BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 SECURITIES
ACT"), OR QUALIFIED OR REGISTERED UNDER ANY STATE SECURITIES LAWS (THE "STATE
SECURITIES LAWS"), AND THIS WARRANT HAS BEEN, AND THE COMMON STOCK TO BE ISSUED
UPON EXERCISE HEREOF WILL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO,
OR FOR RESALE IN CONNECTION WITH, ANY DISTRIBUTION THEREOF.  NO SUCH SALE OR
OTHER DISPOSITION MAY BE MADE WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER
THE 1933 SECURITIES ACT AND COMPLIANCE WITH THE APPLICABLE STATE SECURITIES
LAWS, OR AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO THE ISSUER AND ITS
COUNSEL, THAT SAID REGISTRATION IS NOT REQUIRED UNDER THE 1933 SECURITIES ACT
AND THAT APPLICABLE STATE SECURITIES LAWS HAVE BEEN COMPLIED WITH.

                                    WARRANT

                            Void after March 8, 2004

No. 5                                           Warrant to Purchase Common Stock
                                                         $.05 Par Value

         This certifies that THE NORTH DAKOTA SMALL BUSINESS INVESTMENT COMPANY
("Purchaser"), having an address of c/o InvestAmerica Investment Advisors,
Inc., 101 2nd Street S.E., Suite 800, Cedar Rapids, Iowa 52401, or any party to
whom this Warrant is assigned in compliance with the terms hereof (Purchaser
and any such assignee being hereafter sometimes referred to as "Holder"), is
entitled to subscribe to and purchase, (i) during the period commencing at the
date first set forth above and ending at 5 p.m. Toledo, Ohio local time, on the
"Expiration Date" (as defined below), ONE THOUSAND FOUR HUNDRED SEVENTY TWO
(1,472) shares of fully paid and nonassessable Common Stock (as hereinafter
defined of CENTRUM INDUSTRIES, INC. (the "Company"), a Delaware corporation
with its principal place of business at 6135 Trust Drive, Suite 104A, Holland,
Ohio 43528.  This Warrant is one of a series of Warrants identical in form
issued by the Company pursuant to the Agreement (as defined below), and the
Holder, by acceptance hereof, agrees to be bound by the provisions of such
Agreement as applicable to this Warrant.  The purchase price of each such share
of Common Stock shall be the Warrant Price as defined below.  This Warrant was
originally issued to Purchaser pursuant to the Agreement (as defined below).
<PAGE>   2

                                   ARTICLE I
                                  DEFINITIONS

1.1      "Aggregate Price" shall mean the product, at any time of reference, of
         (i) the Warrant Price multiplied by (ii) the number of shares of
         Warrant Stock.

1.2      "Agreement" shall mean that certain Note and Warrant Purchase
         Agreement entered into by and between Purchaser, among others, and the
         Company of even date herewith.

1.3      "Common Stock" shall mean and include the Company's common stock, par
         value $.05, as constituted on the date hereof, and shall also include
         any capital stock of any class or series of the Company's hereafter
         authorized which shall substitute for or replace the Common Stock as
         constituted on the date hereof; provided, however, that in the event
         the Company authorizes one or more classes or series of capital stock
         qualifying as "Common Stock" for purposes of the foregoing definition,
         in addition to the class of authorized capital stock denominated as
         "Common Stock" in the Company's Certificate of Incorporation as of the
         date hereof, the Holder shall have the right to designate at each time
         it exercises its rights hereunder the class or series of authorized
         capital stock that it elects to purchase in satisfaction of its rights
         hereunder.

1.4      "Common Stock Equivalents" shall mean Convertible Securities and
         Rights.

1.5      "Convertible Securities" means any securities which are directly or
         indirectly convertible into Common Stock.

1.6      "Effective Price" means the quotient obtained by dividing (i) Minimum
         Consideration by (ii) Maximum Shares Upon Exercise.

1.7      "Expiration Date" means March 8, 2004.

1.8      "Maximum Shares Upon Exercise" means the maximum number of shares of
         Common Stock issuable under a Common Stock Equivalent upon complete
         exercise and full conversion of all Rights or Convertible Securities
         represented thereby, computed without regard to contingent adjustments
         to the number of shares issuable upon exercise and conversion.

1.9      "Minimum Consideration" means the minimum aggregate consideration paid
         or payable at any time for the purchase of the Common Stock
         Equivalents during the term of the Common Stock Equivalents, and upon
         complete exercise and full conversion of the Common Stock Equivalents,
         computed without regard to contingent adjustments to  exercise or
         conversion price.





                                       2
<PAGE>   3

1.10     "Notes" means the Company's 11% Convertible Subordinated Notes due
         March 31, 2001, one or more of which has been issued by the Company
         on the date hereof to the  Purchaser, among others, together with any
         note issued in exchange therefor or  replacement thereof.

1.11     "Rights" means any options, warrants, or rights to purchase Common
         Stock or Convertible Securities.

1.12     "Warrant Price" shall mean Two and 00/100 ($2.00) Dollars for each
         share of Common  Stock subject, however, to reduction pursuant to
         Section 3.5 hereof.

1.13     "Warrant Stock" shall mean 1,472 shares of Common Stock, subject to
         reduction as  provided in Section 2.2 hereof.


                                   ARTICLE II
                              EXERCISE AND PAYMENT

2.1      Cash Exercise.  The purchase rights represented by this Warrant may be
         exercised by  Holder, in whole or in part, by written notice of
         exercise delivered to the Company at  least twenty (20) days prior to
         the intended date of exercise and by the surrender of this Warrant at
         the principal office of the Company, and by the payment to the
         Company, by  certified, cashier's or other check acceptable to the
         Company, of an amount equal to the  aggregate Warrant Price of the
         shares being purchased.

2.2      Deemed Exercise Upon Conversion of Notes.  In lieu of exercising this
         Warrant pursuant  to Section 2.1, Holder may elect to convert all or a
         portion of the outstanding principal  balance of any of the Notes into
         shares of Common Stock at a conversion price equal to  the Warrant
         Price pursuant to the terms of such Note, in which event this Warrant
         shall  be deemed, without further act or instrument, to have been
         exercised for a number of  shares of Common Stock equal to the number
         of shares of Common Stock received by  the Purchaser upon such
         conversion, and the number of shares of Warrant Stock subject  to this
         Warrant shall be reduced by an equal number of shares, and this
         Warrant shall  remain in full force and effect with respect to such
         reduced number of shares of Warrant Stock. The foregoing conversion
         shall be effected by delivery of a written notice to the  Company at
         least twenty (20) days prior to the intended date of conversion
         specifying the  amount of outstanding principal to be converted. By
         way of example and illustration  only, if the Purchaser elects to
         convert $100 of the outstanding principal balance of a Note and
         receives 50 shares of Common Stock upon such conversion, the number of
         shares of Warrant Stock subject to this Warrant shall be reduced from
         1,472 to 1,422 and this Warrant shall remain in full force and effect
         with respect to such 1,422 shares of Warrant Stock.





                                       3
<PAGE>   4

2.3      Stock Certificate.  In the event of any exercise of the rights
         represented by this Warrant, certificates for the shares of Common
         Stock so purchased shall be delivered to Holder within a reasonable
         time and, unless this Warrant has been fully exercised or has expired,
         a new Warrant representing the number of shares of Common Stock with
         respect to which this Warrant shall not have been exercised shall also
         be issued to Holder within such time.

2.4      Stock Fully Paid; Reservation of Shares.  The Company covenants and
         agrees that all Common Stock which may be issued upon the exercise of
         the rights represented by this Warrant will, upon issuance, be fully
         paid and nonassessable and free from all taxes, liens and charges with
         respect to the issue thereof (excluding taxes based on the income of
         Holder), provided that any such shares of Common Stock shall be
         subject to the restrictions, obligations and duties imposed upon
         stockholders of the Company pursuant to that certain Equity Holders'
         Agreement, of even date herewith, among the Company and the Purchaser,
         among others, as the same may be amended and supplemented to and
         including the date hereof (the "Equity Holders' Agreement"), and shall
         be subject to applicable restrictions imposed by relevant federal and
         state securities laws relating to capital stock sold in a private
         placement. The Company further covenants and agrees that during the
         period within which the rights represented by this Warrant may be
         exercised, the Company will at all times have authorized and reserved
         for issuance a sufficient number of shares of its Common Stock as
         would be required upon the full exercise of the rights represented by
         this Warrant.

2.5      Fractional Shares.  No fractional share of Common Stock will be issued
         in connection with any exercise hereof, but in lieu of a fractional
         share upon complete exercise hereof, Holder may purchase a whole share
         at the then effective Warrant Price.


                                  ARTICLE III
                        CERTAIN ADJUSTMENTS OF NUMBER OF
                      SHARES PURCHASABLE AND WARRANT PRICE

         The number and kind of securities purchasable upon the exercise of
this Warrant and the Warrant Price shall be subject to adjustment from time to
time upon the occurrence of certain events, as follows:

3.1      Reclassification, Consolidation or Merger.  In case of: (i) any
         reclassification or change of outstanding securities issuable upon
         exercise of this Warrant; (ii) any consolidation or merger of the
         Company with or into another corporation (other than a merger with
         another corporation in which the Company is a continuing corporation
         and which does not result in any reclassification, change or exchange
         of outstanding securities issuable





                                       4
<PAGE>   5

         upon exercise of this Warrant); or (iii) any sale or transfer to
         another corporation of all, or substantially all, of the property of
         the Company, then, and in each such event, the Company or such
         successor or purchasing corporation, as the case may be, shall execute
         a new Warrant which will provide that Holder shall have the right to
         exercise such new Warrant and purchase upon such exercise, in lieu of
         each share of Common Stock theretofore issuable upon exercise of this
         Warrant, the kind and amount of securities, money and property
         receivable upon such reclassification, change, consolidation, merger,
         sale or transfer by a holder of one share of Common Stock issuable
         upon exercise of this Warrant had this Warrant been exercised
         immediately prior to such reclassification, change, consolidation,
         merger, sale or transfer. Such new Warrant shall provide for
         adjustments which shall be as nearly equivalent as may be practicable
         to the adjustments provided in this Section 3 and the provisions of
         this Section 3.1, shall similarly apply to successive
         reclassifications, changes, consolidations, mergers, sales and
         transfers.

3.2      Subdivision or Combination of Shares.  If the Company shall at any
         time while this Warrant remains outstanding and unexercised in whole
         or in part: (i) divide its Common Stock, the Warrant Price shall be
         proportionately reduced; or (ii) combine shares of is Common Stock,
         the Warrant Price shall be proportionately increased.

3.3      Adjustment for Issue or Sale of Shares at Less Than the Warrant Price.
         If, in a transaction other than an issuance excepted from these
         provisions as set forth below or an issuance that causes an adjustment
         under Sections 3.1 or 3.2, the Company shall at any time or from time
         to time, issue any additional shares of Common Stock without
         consideration or for a net consideration per share less than the
         Warrant Price in effect immediately prior to such issuance, then, and
         in each case, the Warrant Price shall be lowered to an amount equal to
         the lowest per share price received, or deemed received, by the
         Company as consideration for such Shares.

         For purposes of this Section 3.3:

                 (i)      There shall be no adjustment under this Section 3.3
                          for any sales or issuances: (a) in a transaction in
                          which an adjustment will be made pursuant to Section
                          3.1 or 3.2; or (b) pursuant to that certain
                          Confidential Private Placement Memorandum of the
                          Company dated November 15, 1995 for the sale of up to
                          2,400,000 shares of the Company's common stock at a
                          price of $1.50 per share; or (c) upon the Company's
                          granting to George Wells, no later than ninety (90)
                          days after March 31, 1996 fiscal year at the
                          discretion of the Company's Board of Directors, based
                          upon satisfaction of certain incentive goals, an
                          option or options to purchase up to 150,000 shares of
                          the Company's common stock at a price of $1.50 per
                          share;





                                       5
<PAGE>   6

                 (ii)     The issuance of Common Stock Equivalents shall be
                          deemed an issuance  at such time of the shares of
                          Common Stock underlying the Common Stock Equivalents.
                          If the Effective Price shall be less than the Warrant
                          Price at the time of such issuance, then an
                          adjustment in the Warrant Price shall be made upon
                          each such issuance in the manner provided in this
                          Section 3.3. No adjustment of the Warrant Price shall
                          be made under this Section 3.3 upon the issuance of
                          shares of Common Stock upon the exercise or
                          conversion of Common Stock Equivalents if an
                          adjustment has previously been made as above
                          provided. Any adjustment of the Warrant Price shall
                          be disregarded, if, as and when such Common Stock
                          Equivalents expire or are cancelled without being
                          exercised so that the Warrant Price effective
                          immediately upon such cancellation or expiration
                          shall be equal to the Warrant Price in effect at the
                          time of the issuance of the expired or cancelled
                          Common Stock Equivalents, with such additional
                          adjustments as would have been made to the Warrant
                          Price had the expired or cancelled Common Stock);
                          Equivalents not been issued.

3.4      Other Action Affecting Common Stock.  (a) If the Company takes any
         action affecting its Common Stock after the date hereof (including
         dividends and distributions), other than an action described in any of
         Sections 3.1 and 3.2 hereof, which would have a material adverse
         effect upon Holder's rights hereunder, the Warrant Price shall be
         adjusted downward in such manner and at such time as the Board of
         Directors of the Company shall in good faith determine to be equitable
         under the circumstances.

                 (b)      In case the Company shall make any distribution of
         its assets to holders of its Common Stock as a liquidation or partial
         liquidation dividend or by ways of return of capital, or other than as
         a dividend payable out of earnings or surplus legally available for
         dividends under the laws of the state of incorporation of the Company,
         and Holder exercises this Warrant within thirty (30) days after the
         later of (i) the record date for the determination of the holders of
         Common Stock entitled to such distribution of assets and (ii) the date
         upon which notice of such distribution is delivered by the Company to
         Holder, Holder shall be entitled to receive, for no additional
         consideration, in addition to the Warrant Stock, the amount of such
         assets (or, at the option of the Company. a sum equal to the value
         thereof at the time of such distribution, such value to be determined
         by the Board of Directors of the Company in good faith) that would
         have been payable to the Holder had it been the holder of record of
         the Warrant Stock on such record date.

                 (c)      In case the Company shall liquidate or wind up its
         affairs, the Holder shall be entitled, upon the exercise hereof, to
         receive, in lieu of the shares of Warrant Stock; that the Holder would
         have been entitled to receive, the same kind and amount of assets as
         would have been issued, paid or otherwise distributed to the Holder
         upon such dissolution, liquidation or winding up with respect to such
         shares of Warrant Stock, had





                                       6
<PAGE>   7

         the Holder been the holder of record of such shares of Warrant Stock
         on the record date for the determination of those entitled to receive
         any such distribution; provided, however, that all rights under this
         Warrant shall terminate on a date fixed by the Company, such date to
         be not earlier than the date of commencement of proceedings for
         dissolution, liquidation or winding up and not later than thirty (30)
         days after such date of commencement, unless the Holder shall have,
         prior to such termination date, exercised this Warrant.  Written
         notice of such termination of rights under this Warrant shall be given
         to the Holder at least thirty (30) days prior to such termination
         date.

3.5      Time of Adjustments to the Warrant Price.  All adjustments to the
         Warrant Price and the number of shares purchasable hereunder, unless
         otherwise specified herein, shall be effective as of the earlier of:

         (i)              the date of issue (or date of sale, if earlier) of
                          the security causing the adjustment;

         (ii)             the effective date of a division or combination of
                          shares;

         (iii)            the record date of any action of holders of the
                          Company's capital stock of any class taken for the
                          purpose of dividing or combining shares or entitling
                          shareholders to receive a distribution or dividends.

3.6      Notice of Adjustments.  In each case of an adjustment in the Warrant
         Price and the number of shares purchasable hereunder, the Company, at
         its expense, shall cause the Treasurer or chief financial officer of
         the Company to compute such adjustment and prepare a certificate
         setting forth such adjustment and showing in detail the facts upon
         which such adjustment is based. The Company shall promptly mail a copy
         of each such certificate to Holder pursuant to Section 6.9 hereof.

3.7      Duration of Adjusted Warrant Price.  Following each adjustment of the
         Warrant Price such adjusted Warrant Price shall remain in effect until
         a further adjustment of the Warrant Price.

3.8      Adjustment of Number of Shares.  Upon each adjustment of the Warrant
         Price pursuant to this Section 3, the number of shares of Warrant
         Stock shall be adjusted to the nearest whole share, to the number
         obtained by dividing the Aggregate Price by the Warrant Price as
         adjusted.





                                       7
<PAGE>   8

                                   ARTICLE IV
                          TRANSFER, EXCHANGE AND LOSS

4.1      Transfer.  This Warrant is transferable on the books of the Company at
         its principal office by the registered Holder hereof upon surrender of
         this Warrant properly endorsed, subject to compliance with federal and
         state securities laws. The Company shall issue and deliver to the
         transferee a new Warrant or Warrants representing the Warrants so
         transferred. Upon any partial transfer, the Company will issue and
         deliver to Holder a new Warrant or Warrants with respect to the
         Warrants not so transferred. Notwithstanding the foregoing, Holder
         shall not be entitled to transfer a number of shares or an interest in
         this Warrant representing less than five percent (5%) of the aggregate
         shares initially covered by this Warrant. Any transferee shall be
         subject to the same restrictions on transfer with respect to this
         Warrant as the Purchaser.

4.9      Securities Laws.  Upon any issuance of shares of Common Stock upon
         exercise of this  warrant, it shall be the Company's responsibility to
         comply with the requirements of:  (1) the 1933 Securities Act; (2) the
         Securities Exchange Act of 1934, as amended; (3)  any applicable
         listing requirements of any national securities exchange; (4) any
         state  securities regulation or "Blue Sky" laws; and (5) requirements
         under any other law or  regulation applicable to the issuance or
         transfer of such shares.  If required by the  Company, in connection
         with each issuance of shares of Common Stock upon exercise  of this
         Warrant, the Holder will give: (i) assurances in writing, satisfactory
         to the  Company, that such shares are not being purchased with a view
         to the distribution thereof  in violation of applicable laws, (ii)
         sufficient information, in writing, to enable the  Company to rely on
         exemptions from the registration or qualification requirements of
         applicable laws, if available, with respect to such exercise, (iii)
         the legal opinion required  by the restrictive legend set forth at the
         beginning of this Warrant, and (iv) its  cooperation to the Company in
         connection with such compliance.

4.3      Exchange.  Subject to compliance with applicable federal and state
         securities laws, this  Warrant is exchangeable at the principal office
         of the Company for Warrants to purchase  the same number of shares of
         Common Stock purchasable hereunder, each new Warrant  to represent the
         right to purchase such number of shares of Common Stock as Holder
         shall designate at the time of such exchange.  Each new Warrant shall
         be identical in  form and content to this Warrant, except for
         appropriate changes in the number of shares  of Common Stock covered
         thereby, the aggregate purchase price of such shares, the  percentage
         stated in Section 4.1 above, and any other changes which are necessary
         in order to prevent the Warrant exchange from changing the respective
         rights and obligations of the Company and the Holder as they existed
         immediately prior to such exchange.





                                       8
<PAGE>   9

4.4      Loss or Mutilation.  Upon receipt by the Company of evidence
         satisfactory to it of the ownership of, and the loss, theft,
         destruction or mutilation of, this Warrant and (in the case of loss,
         theft, or destruction) of indemnity satisfactory to it, and (in the
         case of mutilation) upon surrender and cancellation hereof, the
         Company will execute and deliver in lieu hereof a new Warrant.


                                   ARTICLE V
                                 HOLDER RIGHTS

5.1      No Shareholder Rights Until Exercise.  No Holder hereof, solely by
         virtue hereof, shall be entitled to any rights as a shareholder of the
         Company.  Holder shall have all rights of a shareholder with respect
         to securities purchased upon exercise hereof at the time of cash or
         deemed exercise pursuant to Sections 2.1 and 2.2 hereof.

5.2      Registration Rights.  The Company agrees that any shares of Common
         Stock issued to Holder upon exercise of this Warrant shall be subject
         to the registration rights set forth in the Registration Rights
         Agreement of even date herewith among the Company, the Purchaser and
         others.





                                   ARTICLE VI
                                 MISCELLANEOUS

6.1      Additional Covenants by the Company.  The Company further covenants
         and agrees that it will:

                 a.       Give each Holder prompt written notice of any
                          intended changes to the composition of its capital
                          structure, whether by issuance of new securities or
                          otherwise;

                 b.       Give each Holder written notice of any shareholders'
                          meeting and will allow a representative of each
                          Holder to attend such meetings;

                 c.       Give each Holder at least five days' prior written
                          notice of any action that the Company intends to take
                          by shareholders' written consent;





                                       9
<PAGE>   10

                 d.       Allow, upon reasonable notice and at reasonable
                          times, the inspection of its minute book and other
                          corporate records by a representative of the Holder;
                          and

                 e.       Not engage, other than on arm's length terms, in any
                          transaction with any of its shareholders or
                          affiliates (as such term is defined under Rule 144
                          issued by the Securities and Exchange Commission
                          under the 1933 Securities Act, as amended).

6.2      Governmental Approvals.  The Company will from time to time take all
         action which may be necessary to obtain and keep effective any and all
         permits, consents and approvals of governmental agencies and
         authorities and securities acts filings under federal and state laws,
         which may be or become requisite in connection with the issuance,
         sale, and delivery of this Warrant, and the issuance. sale and
         delivery of the shares of Common Stock or other securities or property
         issuable or deliverable upon exercise of this Warrant.

6.1      Governing Laws.  It is the intention of the parties hereto that except
         as set forth below, the internal laws of the State of Connecticut,
         U.S.A. (irrespective of its choice of law principles) shall govern the
         validity of this warrant, the construction of its terms. and the
         interpretation and enforcement of the rights and duties of the parties
         hereto, provided that the corporation laws of the State of Delaware
         shall govern the procedural and substantive matters pertaining to the
         due authorization, issuance, delivery and exercise of this Warrant and
         the shares of Common Stock upon exercise hereof. Except as set forth
         below, the parties hereby agree that any suit to enforce any provision
         of this Warrant arising out of or based upon this Warrant or the
         business relationship between any of the parties hereto shall be
         brought in the United States District Court for the District of
         Delaware or the courts of the State of Delaware located in Wilmington,
         Delaware.  Each party hereby agrees that such courts shall have
         personal jurisdiction and venue with respect to such party, and each
         party hereby submits to the personal jurisdiction and venue of such
         courts. In addition to the foregoing jurisdiction, Holder at its sole
         option, may commence any such suit in any jurisdiction in which the
         Company has a business office or is incorporated.

6.4      Binding Upon Successors and Assigns.  Subject to, and unless otherwise
         provided in, this Warrant, each and all of the covenants, terms
         provisions, and agreements contained herein shall be binding upon, and
         inure to the benefit of the permitted successors. executors, heirs,
         representatives, administrators and assigns of the parties hereto.

6.5      Severability.  If any one or more provisions of this Warrant, or the
         application thereof, shall for any reason and to any extent be invalid
         or unenforceable, the remainder of this Warrant and the application of
         such provisions to other persons or circumstances shall be





                                       10
<PAGE>   11

         interpreted so as best to reasonably effect the intent of the parties
         hereto. The parties further agree to replace any such void or
         unenforceable provisions of this Warrant with valid and enforceable
         provisions which will achieve, to the extent possible, the economic,
         business and other purposes of the void or unenforceable provisions.

6.6      Default, Amendment and Waivers.  This Warrant may be amended upon the
         written consent of the Company and the Holder. The waiver by a party
         of any breach hereof for default in payment of any amount due
         hereunder or default in the performance hereof shall not be deemed to
         constitute a waiver of any other default or any succeeding breach or
         default. It shall be an event of default under this Warrant if the
         Company breaches any term or condition hereof or fails to perform any
         obligation as and when required hereunder and such breach or failure
         is not cured within thirty (30) days after receiving written notice
         thereof from Holder. Upon such event of default, the Warrant Price for
         all shares shall be reduced by one-fifth and thereafter shall continue
         to be reduced by one-fifth from the then adjusted Warrant Price for
         each successive thirty (30) day period in which such breach is not
         cured.

6.7      No Waiver. The failure of any party to enforce any of the provisions
         hereof shall not  be construed to be a waiver of the right of such
         party thereafter to enforce such  provisions.

6.8      Attorneys' Fees.  Should suit be brought to enforce or interpret any
         part of this Warrant,  the prevailing party shall be entitled to
         recover, as an element of the costs of suit and not  as damages,
         reasonable attorneys fees to be fixed by the court (including without
         limitation, costs, expenses and fees on any appeal). The prevailing
         party shall be the  party entitle to recover its costs of suit,
         regardless of whether such suit proceeds to final  judgment. A party
         not entitled to recover its costs shall not be entitled to recover
         attorneys' fees. No sum for attorneys' fees shall be counted in
         calculating the amount  of a judgment for purposes of determining if a
         party is entitled to recover costs or  attorneys' fees.

6.9      Notices.  Whenever any party hereto desires or is required to give any
         notices, demand, or request with respect to this Warrant, each such
         communication shall be in writing and  shall be effective only if it
         is delivered by personal service or delivered by a nationally
         recognized overnight courier, in each case addressed to the parties
         hereto at their  respective addresses set forth at the beginning of
         this Agreement. Such communication  shall be effective when they are
         received by the addressee thereof. Any party may  change its address
         for such communications by giving notice thereof to the other party
         in conformity with this Section.

6.10     Time.  Time is of the essence of this Warrant.





                                       11
<PAGE>   12

6.11     Construction of Agreement.  This Warrant has been negotiated by the
         respective parties hereto and their attorneys and the language hereof
         shall not be construed for or against any party.

6.12     No Endorsement.  Holder understands that no federal or state
         securities administrator has made any finding or determination
         relating to the fairness of investment in the Company or purchase of
         the Common Stock hereunder and that no federal or state securities
         administrator has recommended or endorsed the offering of securities
         by the Company hereunder.

6.13     Pronouns.  All pronouns and any variations thereof shall be deemed to
         refer to the masculine, feminine or neuter, singular or plural, as the
         identity of the person, persons, entity or entities may require.

6.14     Further Assurances.  Each party agrees to cooperate fully with the
         other parties and to execute such further instruments, documents and
         agreements and to give such further written assurances, as may be
         reasonably requested by any other party to better evidence and reflect
         the transactions described herein and contemplated hereby, and to
         carry into effect the intents and purposes of this Warrant.




         IN WITNESS WHEREOF, the undersigned Company has caused this Common
Stock Warrant to be executed and delivered on the date first above written by
its President, thereunto duly authorized.


                                        COMPANY:

                                        Centrum Industries, Inc.



                                   By:  /s/ George H. Wells
                                        ------------------------------
                                        George Wells
                                        Its President





                                       12

<PAGE>   1
                                                                   EXHIBIT 4.16


                              COMMON STOCK WARRANT

August 1, 1997

NEITHER THIS WARRANT, NOR THE STOCK TO BE ISSUED UPON EXERCISE HEREOF, HAS BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "1933 SECURITIES
ACT"), OR QUALIFIED OR REGISTERED UNDER ANY STATE SECURITIES LAWS (THE "STATE
SECURITIES LAWS"), AND THIS WARRANT HAS BEEN, AND THE COMMON STOCK TO BE ISSUED
UPON EXERCISE HEREOF WILL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO,
OR FOR RESALE IN CONNECTION WITH, ANY DISTRIBUTION THEREOF.  NO SUCH SALE OR
OTHER DISPOSITION MAY BE MADE WITHOUT AN EFFECTIVE REGISTRATION STATEMENT UNDER
THE 1933 SECURITIES ACT AND COMPLIANCE WITH THE APPLICABLE STATE SECURITIES
LAWS, OR AN OPINION OF COUNSEL, REASONABLY SATISFACTORY TO THE ISSUER AND ITS
COUNSEL, THAT SAID REGISTRATION IS NOT REQUIRED UNDER THE 1933 SECURITIES ACT
AND THAT APPLICABLE STATE SECURITIES LAWS HAVE BEEN COMPLIED WITH.

                                    WARRANT

                            Void after March 8, 2004

No. 6                                           Warrant to Purchase Common Stock
                                                           $.05 Par Value

         This certifies that FIRST NEW ENGLAND CAPITAL LP ("Purchaser"),
having an address of 100 Pearl Street, Hartford, Connecticut 06103, or any
party to whom this Warrant is assigned in compliance with the terms hereof
(Purchaser and any such assignee being hereafter sometimes referred to as
"Holder"), is entitled to subscribe to and purchase, (i) during the period
commencing at the date first set forth above and ending at 5 p.m. Toledo, Ohio
local time, on the "Expiration Date" (as defined below), TWO THOUSAND TWO
HUNDRED THIRTY ONE  (2,231) shares of fully paid and nonassessable Common Stock
(as hereinafter defined of CENTRUM INDUSTRIES, INC. (the "Company"), a Delaware
corporation with its principal place of business at 6135 Trust Drive, Suite
104A, Holland, Ohio 43528.  This Warrant is one of a series of Warrants
identical in form issued by the Company pursuant to the Agreement (as defined
below), and the Holder, by acceptance hereof, agrees to be bound by the
provisions of such Agreement as applicable to this Warrant.  The purchase price
of each such share of Common Stock shall be the Warrant Price as defined below.
This Warrant was originally issued to Purchaser pursuant to the Agreement (as
defined below).

<PAGE>   2



                                   ARTICLE I
                                  DEFINITIONS

1.1      "Aggregate Price" shall mean the product, at any time of reference, of
         (i) the Warrant Price multiplied by (ii) the number of shares of
         Warrant Stock.

1.2      "Agreement" shall mean that certain Note and Warrant Purchase
         Agreement entered into by and between Purchaser, among others, and the
         Company of even date herewith.

1.3       "Common Stock" shall mean and include the Company's common stock, par
         value $.05, as constituted on the date hereof, and shall also include
         any capital stock of any class or series of the Company's hereafter
         authorized which shall substitute for or replace the Common Stock as
         constituted on the date hereof; provided, however, that in the event
         the Company authorizes one or more classes or series of capital stock
         qualifying as "Common Stock" for purposes of the foregoing definition,
         in addition to the class of authorized capital stock denominated as
         "Common Stock" in the Company's Certificate of Incorporation as of the
         date hereof, the Holder shall have the right to designate at each time
         it exercises its rights hereunder the class or series of authorized
         capital stock that it elects to purchase in satisfaction of its rights
         hereunder.

1.4      "Common Stock Equivalents" shall mean Convertible Securities and
         Rights.

1.5      "Convertible Securities" means any securities which are directly or
         indirectly convertible into Common Stock.

1.6      "Effective Price" means the quotient obtained by dividing (i) Minimum
         Consideration by (ii) Maximum Shares Upon Exercise.

1.7      "Expiration Date" means March 8, 2004.

1.8      "Maximum Shares Upon Exercise" means the maximum number of shares of
         Common Stock issuable under a Common Stock Equivalent upon complete
         exercise and full conversion of all Rights or Convertible Securities
         represented thereby, computed without regard to contingent adjustments
         to the number of shares issuable upon exercise and conversion.

1.9      "Minimum Consideration" means the minimum aggregate consideration paid
         or payable at any time for the purchase of the Common Stock
         Equivalents during the term of the Common Stock Equivalents, and upon
         complete exercise and full conversion of the Common Stock Equivalents,
         computed without regard to contingent adjustments to  exercise or
         conversion price.




                                      2
<PAGE>   3




1.10     "Notes" means the Company's 11% Convertible Subordinated Notes due
         March 31,  2001, one or more of which has been issued by the Company
         on the date hereof to the  Purchaser, among others, together with any
         note issued in exchange therefor or  replacement thereof.

1.11     "Rights" means any options, warrants, or rights to purchase Common
         Stock or  Convertible Securities.

1.12     "Warrant Price" shall mean Two and 00/100 ($2.00) Dollars for each
         share of Common  Stock subject, however, to reduction pursuant to
         Section 3.5 hereof.

1.13     "Warrant Stock" shall mean 2,231 shares of Common Stock, subject to
         reduction as  provided in Section 2.2 hereof.


                                   ARTICLE II
                              EXERCISE AND PAYMENT

2.1      Cash Exercise.  The purchase rights represented by this Warrant may be
         exercised by  Holder, in whole or in part, by written notice of
         exercise delivered to the Company at  least twenty (20) days prior to
         the intended date of exercise and by the surrender of this Warrant at
         the principal office of the Company, and by the payment to the
         Company, by  certified, cashier's or other check acceptable to the
         Company, of an amount equal to the  aggregate Warrant Price of the
         shares being purchased.

2.2      Deemed Exercise Upon Conversion of Notes.  In lieu of exercising this
         Warrant pursuant  to Section 2.1, Holder may elect to convert all or a
         portion of the outstanding principal  balance of any of the Notes into
         shares of Common Stock at a conversion price equal to  the Warrant
         Price pursuant to the terms of such Note, in which event this Warrant
         shall  be deemed, without further act or instrument, to have been
         exercised for a number of  shares of Common Stock equal to the number
         of shares of Common Stock received by  the Purchaser upon such
         conversion, and the number of shares of Warrant Stock subject  to this
         Warrant shall be reduced by an equal number of shares, and this
         Warrant shall  remain in full force and effect with respect to such
         reduced number of shares of Warrant Stock. The foregoing conversion
         shall be effected by delivery of a written notice to the  Company at
         least twenty (20) days prior to the intended date of conversion
         specifying the  amount of outstanding principal to be converted. By
         way of example and illustration  only, if the Purchaser elects to
         convert $100 of the outstanding principal balance of a Note and
         receives 50 shares of Common Stock upon such conversion, the number of
         shares of Warrant Stock subject to this Warrant shall be reduced from
         2,231 to 2,181 and this Warrant shall remain in full force and effect
         with respect to such 2,181 shares of Warrant Stock.




                                      3
<PAGE>   4





2.3      Stock Certificate.  In the event of any exercise of the rights
         represented by this Warrant, certificates for the shares of Common
         Stock so purchased shall be delivered to Holder within a reasonable
         time and, unless this Warrant has been fully exercised or has expired,
         a new Warrant representing the number of shares of Common Stock with
         respect to which this Warrant shall not have been exercised shall also
         be issued to Holder within such time.

2.4      Stock Fully Paid; Reservation of Shares.  The Company covenants and
         agrees that all Common Stock which may be issued upon the exercise of
         the rights represented by this Warrant will, upon issuance, be fully
         paid and nonassessable and free from all taxes, liens and charges with
         respect to the issue thereof (excluding taxes based on the income of
         Holder), provided that any such shares of Common Stock shall be
         subject to the restrictions, obligations and duties imposed upon
         stockholders of the Company pursuant to that certain Equity Holders'
         Agreement, of even date herewith, among the Company and the Purchaser,
         among others, as the same may be amended and supplemented to and
         including the date hereof (the "Equity Holders' Agreement"), and shall
         be subject to applicable restrictions imposed by relevant federal and
         state securities laws relating to capital stock sold in a private
         placement. The Company further covenants and agrees that during the
         period within which the rights represented by this Warrant may be
         exercised, the Company will at all times have authorized and reserved
         for issuance a sufficient number of shares of its Common Stock as
         would be required upon the full exercise of the rights represented by
         this Warrant.

2.5      Fractional Shares.  No fractional share of Common Stock will be issued
         in connection with any exercise hereof, but in lieu of a fractional
         share upon complete exercise hereof, Holder may purchase a whole share
         at the then effective Warrant Price.


                                  ARTICLE III
                        CERTAIN ADJUSTMENTS OF NUMBER OF
                      SHARES PURCHASABLE AND WARRANT PRICE

         The number and kind of securities purchasable upon the exercise of
this Warrant and the Warrant Price shall be subject to adjustment from time to
time upon the occurrence of certain events, as follows:

3.1      Reclassification, Consolidation or Merger.  In case of: (i) any
         reclassification or change of outstanding securities issuable upon
         exercise of this Warrant; (ii) any consolidation or merger of the
         Company with or into another corporation (other than a merger with
         another corporation in which the Company is a continuing corporation
         and which does not result in any reclassification, change or exchange
         of outstanding securities issuable



                                      4

<PAGE>   5



         upon exercise of this Warrant); or (iii) any sale or transfer to
         another corporation of all, or substantially all, of the property of
         the Company, then, and in each such event, the Company or such
         successor or purchasing corporation, as the case may be, shall execute
         a new Warrant which will provide that Holder shall have the right to
         exercise such new Warrant and purchase upon such exercise, in lieu of
         each share of Common Stock theretofore issuable upon exercise of this
         Warrant, the kind and amount of securities, money and property
         receivable upon such reclassification, change, consolidation, merger,
         sale or transfer by a holder of one share of Common Stock issuable
         upon exercise of this Warrant had this Warrant been exercised
         immediately prior to such reclassification, change, consolidation,
         merger, sale or transfer. Such new Warrant shall provide for
         adjustments which shall be as nearly equivalent as may be practicable
         to the adjustments provided in this Section 3 and the provisions of
         this Section 3.1, shall similarly apply to successive
         reclassifications, changes, consolidations, mergers, sales and
         transfers.

3.2      Subdivision or Combination of Shares.  If the Company shall at any
         time while this Warrant remains outstanding and unexercised in whole
         or in part: (i) divide its Common Stock, the Warrant Price shall be
         proportionately reduced; or (ii) combine shares of is Common Stock,
         the Warrant Price shall be proportionately increased.

3.3      Adjustment for Issue or Sale of Shares at Less Than the Warrant Price.
         If, in a transaction other than an issuance excepted from these
         provisions as set forth below or an issuance that causes an adjustment
         under Sections 3.1 or 3.2, the Company shall at any time or from time
         to time, issue any additional shares of Common Stock without
         consideration or for a net consideration per share less than the
         Warrant Price in effect immediately prior to such issuance, then, and
         in each case, the Warrant Price shall be lowered to an amount equal to
         the lowest per share price received, or deemed received, by the
         Company as consideration for such Shares.

         For purposes of this Section 3.3:

                 (i)      There shall be no adjustment under this Section 3.3
                          for any sales or issuances: (a) in a transaction in
                          which an adjustment will be made pursuant to Section
                          3.1 or 3.2; or (b) pursuant to that certain
                          Confidential Private Placement Memorandum of the
                          Company dated November 15, 1995 for the sale of up to
                          2,400,000 shares of the Company's common stock at a
                          price of $1.50 per share; or (c) upon the Company's
                          granting to George Wells, no later than ninety (90)
                          days after March 31, 1996 fiscal year at the
                          discretion of the Company's Board of Directors, based
                          upon satisfaction of certain incentive goals, an
                          option or options to purchase up to 150,000 shares of
                          the Company's common stock at a price of $1.50 per
                          share;




                                      5
<PAGE>   6





                 (ii)     The issuance of Common Stock Equivalents shall be
                          deemed an issuance  at such time of the shares of
                          Common Stock underlying the Common Stock Equivalents.
                          If the Effective Price shall be less than the Warrant
                          Price at the time of such issuance, then an
                          adjustment in the Warrant Price shall be made upon
                          each such issuance in the manner provided in this
                          Section 3.3. No adjustment of the Warrant Price shall
                          be made under this Section 3.3 upon the issuance of
                          shares of Common Stock upon the exercise or
                          conversion of Common Stock Equivalents if an
                          adjustment has previously been made as above
                          provided. Any adjustment of the Warrant Price shall
                          be disregarded, if, as and when such Common Stock
                          Equivalents expire or are cancelled without being
                          exercised so that the Warrant Price effective
                          immediately upon such cancellation or expiration
                          shall be equal to the Warrant Price in effect at the
                          time of the issuance of the expired or cancelled
                          Common Stock Equivalents, with such additional
                          adjustments as would have been made to the Warrant
                          Price had the expired or cancelled Common Stock);
                          Equivalents not been issued.

3.4      Other Action Affecting Common Stock.  (a) If the Company takes any
         action affecting its Common Stock after the date hereof (including
         dividends and distributions), other than an action described in any of
         Sections 3.1 and 3.2 hereof, which would have a material adverse
         effect upon Holder's rights hereunder, the Warrant Price shall be
         adjusted downward in such manner and at such time as the Board of
         Directors of the Company shall in good faith determine to be equitable
         under the circumstances.

                 (b)      In case the Company shall make any distribution of
         its assets to holders of its Common Stock as a liquidation or partial
         liquidation dividend or by ways of return of capital, or other than as
         a dividend payable out of earnings or surplus legally available for
         dividends under the laws of the state of incorporation of the Company,
         and Holder exercises this Warrant within thirty (30) days after the
         later of (i) the record date for the determination of the holders of
         Common Stock entitled to such distribution of assets and (ii) the date
         upon which notice of such distribution is delivered by the Company to
         Holder, Holder shall be entitled to receive, for no additional
         consideration, in addition to the Warrant Stock, the amount of such
         assets (or, at the option of the Company. a sum equal to the value
         thereof at the time of such distribution, such value to be determined
         by the Board of Directors of the Company in good faith) that would
         have been payable to the Holder had it been the holder of record of
         the Warrant Stock on such record date.

                 (c)      In case the Company shall liquidate or wind up its
         affairs, the Holder shall be entitled, upon the exercise hereof, to
         receive, in lieu of the shares of Warrant Stock; that the Holder would
         have been entitled to receive, the same kind and amount of assets as
         would have been issued, paid or otherwise distributed to the Holder
         upon such dissolution, liquidation or winding up with respect to such
         shares of Warrant Stock, had




                                      6
<PAGE>   7



         the Holder been the holder of record of such shares of Warrant Stock
         on the record date for the determination of those entitled to receive
         any such distribution; provided, however, that all rights under this
         Warrant shall terminate on a date fixed by the Company, such date to
         be not earlier than the date of commencement of proceedings for
         dissolution, liquidation or winding up and not later than thirty (30)
         days after such date of commencement, unless the Holder shall have,
         prior to such termination date, exercised this Warrant.  Written
         notice of such termination of rights under this Warrant shall be given
         to the Holder at least thirty (30) days prior to such termination
         date.

3.5      Time of Adjustments to the Warrant Price.  All adjustments to the
         Warrant Price and the number of shares purchasable hereunder, unless
         otherwise specified herein, shall be effective as of the earlier of:

         (i)              the date of issue (or date of sale, if earlier) of
                          the security causing the adjustment;

         (ii)             the effective date of a division or combination of
                          shares;

         (iii)            the record date of any action of holders of the
                          Company's capital stock of any class taken for the
                          purpose of dividing or combining shares or entitling
                          shareholders to receive a distribution or dividends.

3.6      Notice of Adjustments.  In each case of an adjustment in the Warrant
         Price and the number of shares purchasable hereunder, the Company, at
         its expense, shall cause the Treasurer or chief financial officer of
         the Company to compute such adjustment and prepare a certificate
         setting forth such adjustment and showing in detail the facts upon
         which such adjustment is based. The Company shall promptly mail a copy
         of each such certificate to Holder pursuant to Section 6.9 hereof.

3.7      Duration of Adjusted Warrant Price.  Following each adjustment of the
         Warrant Price such adjusted Warrant Price shall remain in effect until
         a further adjustment of the Warrant Price.

3.8      Adjustment of Number of Shares.  Upon each adjustment of the Warrant
         Price pursuant to this Section 3, the number of shares of Warrant
         Stock shall be adjusted to the nearest whole share, to the number
         obtained by dividing the Aggregate Price by the Warrant Price as
         adjusted.




                                      7
<PAGE>   8





                                   ARTICLE IV
                          TRANSFER, EXCHANGE AND LOSS

4.1      Transfer.  This Warrant is transferable on the books of the Company at
         its principal office by the registered Holder hereof upon surrender of
         this Warrant properly endorsed, subject to compliance with federal and
         state securities laws. The Company shall issue and deliver to the
         transferee a new Warrant or Warrants representing the Warrants so
         transferred. Upon any partial transfer, the Company will issue and
         deliver to Holder a new Warrant or Warrants with respect to the
         Warrants not so transferred. Notwithstanding the foregoing, Holder
         shall not be entitled to transfer a number of shares or an interest in
         this Warrant representing less than five percent (5%) of the aggregate
         shares initially covered by this Warrant. Any transferee shall be
         subject to the same restrictions on transfer with respect to this
         Warrant as the Purchaser.

4.9      Securities Laws.  Upon any issuance of shares of Common Stock upon
         exercise of this  warrant, it shall be the Company's responsibility to
         comply with the requirements of:  (1) the 1933 Securities Act; (2) the
         Securities Exchange Act of 1934, as amended; (3)  any applicable
         listing requirements of any national securities exchange; (4) any
         state  securities regulation or "Blue Sky" laws; and (5) requirements
         under any other law or  regulation applicable to the issuance or
         transfer of such shares.  If required by the  Company, in connection
         with each issuance of shares of Common Stock upon exercise  of this
         Warrant, the Holder will give: (i) assurances in writing, satisfactory
         to the  Company, that such shares are not being purchased with a view
         to the distribution thereof  in violation of applicable laws, (ii)
         sufficient information, in writing, to enable the  Company to rely on
         exemptions from the registration or qualification requirements of
         applicable laws, if available, with respect to such exercise, (iii)
         the legal opinion required  by the restrictive legend set forth at the
         beginning of this Warrant, and (iv) its  cooperation to the Company in
         connection with such compliance.

4.3      Exchange.  Subject to compliance with applicable federal and state
         securities laws, this  Warrant is exchangeable at the principal office
         of the Company for Warrants to purchase  the same number of shares of
         Common Stock purchasable hereunder, each new Warrant  to represent the
         right to purchase such number of shares of Common Stock as Holder
         shall designate at the time of such exchange.  Each new Warrant shall
         be identical in  form and content to this Warrant, except for
         appropriate changes in the number of shares  of Common Stock covered
         thereby, the aggregate purchase price of such shares, the  percentage
         stated in Section 4.1 above, and any other changes which are necessary
         in order to prevent the Warrant exchange from changing the respective
         rights and obligations of the Company and the Holder as they existed
         immediately prior to such exchange.



                                      8

<PAGE>   9




4.4      Loss or Mutilation.  Upon receipt by the Company of evidence
         satisfactory to it of the ownership of, and the loss, theft,
         destruction or mutilation of, this Warrant and (in the case of loss,
         theft, or destruction) of indemnity satisfactory to it, and (in the
         case of mutilation) upon surrender and cancellation hereof, the
         Company will execute and deliver in lieu hereof a new Warrant.


                                   ARTICLE V
                                 HOLDER RIGHTS

5.1      No Shareholder Rights Until Exercise.  No Holder hereof, solely by
         virtue hereof, shall be entitled to any rights as a shareholder of the
         Company.  Holder shall have all rights of a shareholder with respect
         to securities purchased upon exercise hereof at the time of cash or
         deemed exercise pursuant to Sections 2.1 and 2.2 hereof.

5.2      Registration Rights.  The Company agrees that any shares of Common
         Stock issued to Holder upon exercise of this Warrant shall be subject
         to the registration rights set forth in the Registration Rights
         Agreement of even date herewith among the Company, the Purchaser and
         others.





                                   ARTICLE VI
                                 MISCELLANEOUS

6.1      Additional Covenants by the Company.  The Company further covenants
         and agrees that it will:

                 a.       Give each Holder prompt written notice of any
                          intended changes to the composition of its capital
                          structure, whether by issuance of new securities or
                          otherwise;

                 b.       Give each Holder written notice of any shareholders'
                          meeting and will allow a representative of each
                          Holder to attend such meetings;

                 c.       Give each Holder at least five days' prior written
                          notice of any action that the Company intends to take
                          by shareholders' written consent;



                                      9

<PAGE>   10





                 d.       Allow, upon reasonable notice and at reasonable
                          times, the inspection of its minute book and other
                          corporate records by a representative of the Holder;
                          and

                 e.       Not engage, other than on arm's length terms, in any
                          transaction with any of its shareholders or
                          affiliates (as such term is defined under Rule 144
                          issued by the Securities and Exchange Commission
                          under the 1933 Securities Act, as amended).

6.2      Governmental Approvals.  The Company will from time to time take all
         action which may be necessary to obtain and keep effective any and all
         permits, consents and approvals of governmental agencies and
         authorities and securities acts filings under federal and state laws,
         which may be or become requisite in connection with the issuance,
         sale, and delivery of this Warrant, and the issuance. sale and
         delivery of the shares of Common Stock or other securities or property
         issuable or deliverable upon exercise of this Warrant.

6.1      Governing Laws.  It is the intention of the parties hereto that except
         as set forth below, the internal laws of the State of Connecticut,
         U.S.A. (irrespective of its choice of law principles) shall govern the
         validity of this warrant, the construction of its terms. and the
         interpretation and enforcement of the rights and duties of the parties
         hereto, provided that the corporation laws of the State of Delaware
         shall govern the procedural and substantive matters pertaining to the
         due authorization, issuance, delivery and exercise of this Warrant and
         the shares of Common Stock upon exercise hereof. Except as set forth
         below, the parties hereby agree that any suit to enforce any provision
         of this Warrant arising out of or based upon this Warrant or the
         business relationship between any of the parties hereto shall be
         brought in the United States District Court for the District of
         Delaware or the courts of the State of Delaware located in Wilmington,
         Delaware.  Each party hereby agrees that such courts shall have
         personal jurisdiction and venue with respect to such party, and each
         party hereby submits to the personal jurisdiction and venue of such
         courts. In addition to the foregoing jurisdiction, Holder at its sole
         option, may commence any such suit in any jurisdiction in which the
         Company has a business office or is incorporated.

6.4      Binding Upon Successors and Assigns.  Subject to, and unless otherwise
         provided in, this Warrant, each and all of the covenants, terms
         provisions, and agreements contained herein shall be binding upon, and
         inure to the benefit of the permitted successors. executors, heirs,
         representatives, administrators and assigns of the parties hereto.

6.5      Severability.  If any one or more provisions of this Warrant, or the
         application thereof, shall for any reason and to any extent be invalid
         or unenforceable, the remainder of this Warrant and the application of
         such provisions to other persons or circumstances shall be




                                     10
<PAGE>   11



         interpreted so as best to reasonably effect the intent of the parties
         hereto. The parties further agree to replace any such void or
         unenforceable provisions of this Warrant with valid and enforceable
         provisions which will achieve, to the extent possible, the economic,
         business and other purposes of the void or unenforceable provisions.

6.6      Default, Amendment and Waivers.  This Warrant may be amended upon the
         written consent of the Company and the Holder. The waiver by a party
         of any breach hereof for default in payment of any amount due
         hereunder or default in the performance hereof shall not be deemed to
         constitute a waiver of any other default or any succeeding breach or
         default. It shall be an event of default under this Warrant if the
         Company breaches any term or condition hereof or fails to perform any
         obligation as and when required hereunder and such breach or failure
         is not cured within thirty (30) days after receiving written notice
         thereof from Holder. Upon such event of default, the Warrant Price for
         all shares shall be reduced by one-fifth and thereafter shall continue
         to be reduced by one-fifth from the then adjusted Warrant Price for
         each successive thirty (30) day period in which such breach is not
         cured.

6.7      No Waiver. The failure of any party to enforce any of the provisions
         hereof shall not  be construed to be a waiver of the right of such
         party thereafter to enforce such  provisions.

6.8      Attorneys' Fees.  Should suit be brought to enforce or interpret any
         part of this Warrant,  the prevailing party shall be entitled to
         recover, as an element of the costs of suit and not  as damages,
         reasonable attorneys fees to be fixed by the court (including without
         limitation, costs, expenses and fees on any appeal). The prevailing
         party shall be the  party entitle to recover its costs of suit,
         regardless of whether such suit proceeds to final  judgment. A party
         not entitled to recover its costs shall not be entitled to recover
         attorneys' fees. No sum for attorneys' fees shall be counted in
         calculating the amount  of a judgment for purposes of determining if a
         party is entitled to recover costs or  attorneys' fees.

6.9      Notices.  Whenever any party hereto desires or is required to give any
         notices, demand, or request with respect to this Warrant, each such
         communication shall be in writing and  shall be effective only if it
         is delivered by personal service or delivered by a nationally
         recognized overnight courier, in each case addressed to the parties
         hereto at their  respective addresses set forth at the beginning of
         this Agreement. Such communication  shall be effective when they are
         received by the addressee thereof. Any party may  change its address
         for such communications by giving notice thereof to the other party
         in conformity with this Section.

6.10     Time.  Time is of the essence of this Warrant.



                                      11

<PAGE>   12




6.11     Construction of Agreement.  This Warrant has been negotiated by the
         respective parties hereto and their attorneys and the language hereof
         shall not be construed for or against any party.

6.12     No Endorsement.  Holder understands that no federal or state
         securities administrator has made any finding or determination
         relating to the fairness of investment in the Company or purchase of
         the Common Stock hereunder and that no federal or state securities
         administrator has recommended or endorsed the offering of securities
         by the Company hereunder.

6.13     Pronouns.  All pronouns and any variations thereof shall be deemed to
         refer to the masculine, feminine or neuter, singular or plural, as the
         identity of the person, persons, entity or entities may require.

6.14     Further Assurances.  Each party agrees to cooperate fully with the
         other parties and to execute such further instruments, documents and
         agreements and to give such further written assurances, as may be
         reasonably requested by any other party to better evidence and reflect
         the transactions described herein and contemplated hereby, and to
         carry into effect the intents and purposes of this Warrant.




         IN WITNESS WHEREOF, the undersigned Company has caused this Common
Stock Warrant to be executed and delivered on the date first above written by
its President, thereunto duly authorized.


                                               COMPANY:
                                     
                                               Centrum Industries, Inc.
                                     
                                     
                                     
                                       By:     /s/ George H. Wells
                                               -------------------
                                               George Wells
                                               Its President
                                     
                                     
                                     
                                     12



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