Document:

ex10-21

EXHIBIT 10.21

SIXTH AMENDMENT TO

AMENDED AND RESTATED LOAN AGREEMENT

DATED AS OF SEPTEMBER 30, 1996

      THIS SIXTH AMENDMENT TO AMENDED AND RESTATED LOAN AGREEMENT (the “Sixth
Amendment”) effective as of the 12th day of July, 2000, by and among MAXCO,
INC., a Michigan Corporation (“Borrower”) and COMERICA BANK, a Michigan banking
corporation (“Bank”).

W I T N E S S E T H

      WHEREAS, Borrower and Bank entered into a certain Amended and Restated
Loan Agreement dated September 30, 1996, as amended by First Amendment thereto
dated as of August 1, 1997, as further amended by Second Amendment thereto
dated as of June 24, 1998, as further amended by Third Amendment thereto dated
as of September 24, 1998, as further amended by Fourth Amendment thereto dated
as of June 22, 1999, and as further amended by Fifth Amendment thereto dated as
of September 1, 1999 (the “Agreement”); and

      WHEREAS, Borrower and Bank now desire to amend the Agreement to provide
for the (i) increase the Commitment Amount and (ii) modification of the
interest rate.

      NOW, THEREFORE, in consideration of the premises and the mutual covenants
herein contained, the Borrower and the Bank hereby agree as follows:

      1. In Sub-Section 1.1 of Section 1 of the Agreement, the following
definitions are hereby deleted in their entirety and replaced by the following:

      “Commitment Amount” shall mean $20,000,000 (or such lesser amount to which
the Commitment Amount may be reduced by the Borrower from time to time under
Section 2.8.1 of this Agreement) to and through December 31, 2000, and
thereafter shall mean $18,000,000.

      2. Notwithstanding anything contained in the Agreement to the contrary,
each and every reference to “Euro-dollar-based Rate” and all provisions of the
Agreement related thereto are hereby deleted in their entirety, provided, that
(i) nothing in this Sixth Amendment is intended to modify the terms and
conditions of any outstanding Eurodollar-based Advance under a Note, as of the
date hereof, and (ii) the intent of this provision of this Sixth Amendment is
to require any and all Advances under the Notes, as amended, on or after the
date hereof, to utilize the Prime-based Rate.

      3. Notwithstanding anything contained in the Agreement to the contrary,
Borrower shall, in addition to any other reporting requirements provided for in
Section 6 of the Agreement, as amended, furnish to the Bank, in such form and
at such times as may be satisfactory, the following documents:

		
	 	      (a) All Monthly Operating Statements

		
	 	      (b) Quarterly 10-Qs and Annual 10-Ks for Borrower.

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      (c) Quarterly statements from Borrower, which shall include consolidating
statements of all Subsidiaries.

      4. Notwithstanding anything contained in the Agreement to the contrary,
Borrower hereby confirms and ratifies all of the covenants contained in the
Agreement, and hereby specifically agrees that the following shall be
considered, to the extent applicable, a part of Section 6 and/or Section 7 of
the Agreement:

      (a) Borrower shall not make any loans, advances or extensions of credit to
any Person, except for sales on open account and otherwise in the ordinary
course of business and advances to an existing wholly-owned Subsidiary of
Borrower for working capital.

      (b) Borrower shall not guarantee or otherwise, directly or indirectly, in
any way be or become responsible for obligations of any other Person, whether
by agreement to purchase the indebtedness of any other Person, agreement for
the furnishing of funds to any other Person through the furnishing of goods,
supplies or services, by way of stock purchase, capital contribution, advance
or loan, for the purpose of paying or discharging (or causing the payment or
discharge of) the indebtedness of any other Person, or otherwise, except for
(i) the endorsement of negotiable instruments by the Borrower or the
Subsidiaries in the ordinary course of business for deposit or collection, and
(ii) the guaranty by the Borrower of any and all obligations of any existing
Subsidiary wholly-owned by Borrower.

      (c) Borrower shall, over a period of twelve (12) months from the date of
this Sixth Amendment, reduce Borrower’s real estate related guarantees on
stabilized and unstabilized properties under development and shall promptly
furnish to the Bank a schedule for such reduction, which is satisfactory to the
Bank as to the timing and amount of such guarantee reductions.

      (d) Borrower shall furnish to the Bank a schedule for the repayment of
outstanding credit facilities to L/M Associates, L.L.C. and L/M Associates II,
L.L.C. which is satisfactory to the Bank as to the timing and amount.

      (e) Borrower shall not declare or pay any dividend on, or make any other
distribution with respect to (whether by reduction of capital or otherwise),
any shares of its capital stock, including but not limited to dividends
previously permitted under the Agreement on any of Borrower’s preferred stock
series, except that (i) dividends from any Subsidiary to the Borrower are
permitted, (ii) the dividend on the preferred stock series which have been
properly declared and payable on June 30, 2000 (with balance to be paid on or
about July 14, 2000) are permitted.

      5. Except as specifically modified hereby, the terms and conditions of the
Agreement and the Notes remain in full force and effect and the undersigned
hereby ratify and agrees to be bound by the terms of the Agreement as hereby
amended.

      6. Neither the extension of this Sixth Amendment by the Bank, nor any
other act or omission by the Bank in connection herewith, shall be deemed an
express or implied waiver by the Bank of any default under the Agreement.
Without limiting the generality of the foregoing, the Borrower hereby expressly
acknowledges that (i) as of the date hereof, certain events have or may
have occurred and continue (“Existing Events”), which upon the giving of any
required notice and

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the expiration of any applicable cure periods, would
constitute Events of Default under Section 8 of the Agreement and (ii) the Bank
hereby expressly reserves the right, at any time, to provide such notice or
take other remedial action provided for in the Agreement relative to the
Existing Events.

      IN WITNESS WHEREOF, the Borrower and the Bank have caused this Sixth
Amendment to be executed by their duly authorized officers as of the day and
year first written above.

	 
	MAXCO, INC
	 
	By /S/ VINCENT SHUNSKY
______________________________

Vincent Shunsky

Its Vice President
	 
	COMERICA BANK
	 
	By /S/ THOMAS MELTON
______________________________

Thomas Melton

Its First Vice President

-3-

      The Undersigned Guarantors hereby acknowledge and consent to the above
Sixth Amendment.

	 	 	 
	Ersco Corporation

By    /S/ VINCENT SHUNSKY

		
Pak-Sak Industries, Inc.

By    /S/ VINCENT SHUNSKY

	Vincent Shunsky

Its Treasurer		
Vincent Shunsky

Its Treasurer
	 
	Wisconsin Wire & Steel, Inc.

By    /S/ VINCENT SHUNSKY

		
Atmosphere Annealing, Inc.

By    /S/ VINCENT SHUNSKY

	Vincent Shunsky

Its Treasurer		
Vincent Shunsky

Its Treasurer

-4-<PAGE>   1
                                                                     EXHIBIT 4.1

                          REGISTRATION RIGHTS AGREEMENT

         THIS REGISTRATION RIGHTS AGREEMENT ("Agreement") is made this 30th day
of June, 2000, by and between the RONALD C. CAUSLEY, TRUSTEE OF RONALD C.
CAUSLEY REVOCABLE TRUST DATED MARCH 14, 1990, AS AMENDED ("Holder"), having an
address of 10089 Creekwood Trail, Davisburg, MI 48350 and NEMATRON CORPORATION,
a Michigan corporation, with offices at 5840 Interface Drive, Ann Arbor,
Michigan 48103 ("Company").

         The Company and the Holder are parties to a Stock Purchase Agreement of
even date herewith pursuant to which the Holder, in connection with the sale of
A-OK Controls Engineering, Inc. to the Company, is receiving 604,186 shares of
the Company's Common Stock, no par value per share ("Common Stock"). In
connection with the issuance of the Common Stock, the Company has agreed to
provide the Holder with the certain registration rights.

         1. CERTAIN DEFINITIONS. As used in this Agreement, the following
capitalized terms shall have the following respective meanings:

            "COMMISSION" shall mean the Securities and Exchange Commission or
any other federal agency at the time administering the Securities Act.

            "REGISTRABLE SECURITIES" shall mean the 604,186 shares of the
Company's Common Stock issued to the Holder, and any securities issued in
respect of such shares upon any conversion, stock split, stock dividend,
recapitalization or similar event, which have not been sold to the public
pursuant to a Registration.

            The terms "REGISTER, "REGISTERED" AND "REGISTRATION" shall refer to
a registration effected by preparing and filing a registration statement in
compliance with the Securities Act and applicable rules and regulations
promulgated thereunder, and the declaration or ordering of the effectiveness of
such registration statement.

            "REGISTRATION EXPENSES" shall mean all expenses incurred by the
Company in compliance with Section 2 hereof, including, without limitation, all
Registration and filing fees, printing expenses, escrow fees, fees and
disbursements of counsel for the Company, blue sky fees and expenses, and the
expenses of any special audits incident to or required by any such Registration
but shall not include Selling Expenses, fees and disbursements of counsel for
the Holders.

            "SECURITIES ACT" shall mean the Securities Act of 1933, as amended,
or any similar federal statute and the rules and regulations of the Commission
thereunder, all as the same shall be in effect at the time.

<PAGE>   2

            "SELLING EXPENSES" shall mean all underwriting discounts, selling
commissions and stock transfer fees applicable to the sale of Registrable
Securities and all fees and disbursements of counsel for the Holder.

         2. COMPANY REGISTRATION.

            2.1 NOTICE OF REGISTRATION. If at any time or from time to time the
Company shall determine to Register any of its capital stock or other issued
securities, either for its own account or the account of a security holder or
holders (other than the Holder), other than (x) a Registration relating solely
to employee benefit plans, or (y) a Registration relating solely to a Commission
Rule 145 transaction, or (z) a Registration on any Registration form which does
not permit secondary sales or does not include substantially the same
information as would be required to be included in a Registration statement
covering the sale of Registrable Securities, the Company shall:

            2.1.1. promptly give to the Holder written notice thereof; and

            2.1.2. use its best efforts to include in such Registration (and any
related qualification under blue sky laws or other compliance) and in any
underwriting involved therein, all the Registrable Securities specified in a
written request or requests made by the Holder within ten (10) days after the
Holder's receipt of the written notice from the Company described in Section
2.1.1 above, except as set forth in Section 2.2 below.

            2.2 UNDERWRITING. If the Registration of which the Company gives
notice is for a Registered public offering involving an underwriting, the
Company shall so advise the Holder as a part of the written notice given
pursuant to Section 2.1.1. In such event the right of the Holder to Registration
pursuant to this Section 2 shall be conditioned upon the Holder's participation
in such underwriting and the inclusion of the Holder's Registrable Securities in
the underwriting to the extent provided herein. The Holder, if proposing to
distribute its securities through such underwriting, shall (together with the
Company and the other holders of securities of the Company with registration
rights to participate therein, distributing their securities through such
underwriting), enter into an underwriting agreement in customary form with the
managing underwriter selected for underwriting by the Company. Notwithstanding
any other provision of this Section 2, if the managing underwriter advises the
Company in writing that marketing factors require a limitation on the number of
shares to be underwritten, the underwriter may (subject to the allocation
priority set forth below), exclude all Registrable Securities from or limit the
number of Registrable Securities to be included in the Registration and
underwriting. If a limitation on the number of Registrable Securities is
required as a result of these limits, the number of Registrable Securities that
may be included in the Registration and underwriting shall be allocated among
all such holders requesting to participate in such Registration in proportion,
as nearly as practicable, to the respective amounts of registrable securities
which they had requested to be included in such Registration at the time of
filing the Registration statement. No Registrable Securities excluded from the
underwriting by reason of the managing. underwriter's marketing limitation shall
be included in such Registration.

                                       2
<PAGE>   3

         3. EXPENSES OF REGISTRATION. All Registration Expenses incurred in
connection with any Registration, qualification or compliance pursuant to this
Agreement shall be borne by the Company, and all Selling Expenses shall be borne
by the holders of the securities so Registered pro rata on the basis of the
number of their shares so Registered.

         4. REGISTRATION PROCEDURES. In the case of each Registration,
qualification or compliance effected by the Company pursuant to this Agreement,
the Company will keep the Holder, if participating therein, advised in writing
as to the initiation of each Registration, qualification or compliance and as to
the completion thereof. At its expense, the Company will use its best efforts
to:

            4.1. Except for offerings pursuant to Rule 145 or successors thereto
under the Securities Act, the Company will keep such Registration, qualification
or compliance effective and current for a period of one hundred twenty (120)
days or until the Holder has completed the distribution described in the
Registration statement relating thereto, whichever first occurs.

            4.2 The Company will furnish such number of prospectuses and other
documents incident thereto as the Holder from time to time may reasonably
request.

            4.3 The Company will notify the Holder, if Registrable Securities
are covered by a Registration statement, at any time when a prospectus relating
thereto covered by such Registration statement is required to be delivered under
the Securities Act, of the happening of any event as a result of which the
prospectus included in such Registration statement includes an untrue statement
of a material fact or omits to state a material fact required to be stated
therein or necessary to make the statements therein not misleading in the light
of circumstances then existing.

         5. INDEMNIFICATION.

            5.1 The Company will indemnify the Holder, its trustee, and each
person controlling (within the meaning of the Securities Act) the Holder and the
Holder's legal counsel and independent accountants, with respect to which
Registration, qualification or compliance has been effected pursuant to this
Agreement, against all expenses, claims, losses, damages and liabilities (or
actions in respect thereof) including any of the foregoing incurred in
settlement of any litigation, commenced or threatened, arising out of or based
on any untrue statement (or alleged untrue statement) of a material fact
contained in any prospectus, offering circular or other document (including any
related registration statement, notification or the like) incident to any such
Registration, qualification or compliance, or based on any omission (or alleged
omission) to state therein a material fact required to be stated therein or
necessary to make the statements therein not misleading, or any violation by the
Company of the Securities Act or any rule or regulation thereunder or any state
securities law applicable to the Company and relating to action or inaction
required of the Company in connection with any such Registration, qualification
or compliance, and will reimburse the Holder, its trustee and each person
controlling the Holder, for any legal and any other expenses reasonably incurred
in connection with investigating, defending any such claim, loss, damage,
liability, or action, provided that the Company will not be liable in any case
to the extent that any such claim, loss, damage liability or expense arises out
of or is

                                       3

<PAGE>   4

based on any untrue statement or omission based upon written information
furnished to the Company by such Holder and stated to be specifically for use
therein. It is agreed that the indemnity agreement contain in this Section 5.1
shall not apply to amounts paid in settlement of any such loss, claim, damage,
liability or action if settlement is effected without the consent of the Company
(which consent has not been unreasonably withheld).

            5.2. The Holder, if Registrable Securities held by him are included
in the securities as to which such Registration, qualification or compliance is
being effected, will indemnify the Company and each of its directors and
officers each person who controls the Company within the meaning of the
Securities Act and the rules and regulations thereunder, each other such holder
participating in such Registration, and each of their officers, directors and
partners, and each person controlling such Holder and the legal counsel and
independent accountants of the foregoing persons against all claims, losses,
damages and liabilities (or actions in respect thereof) arising out of or based
on any untrue statement (or alleged untrue statement) of a material fact
contained in any such registration statement, prospectus, offering circular or
other document, or any omission (or alleged omission) to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading, and will reimburse the Company and such holders,
directors, officers, partners, persons or control persons for any legal or any
other expenses reasonable incurred in connection with investigating or
defending. any such claim, loss, damage, liability or action, in each case to
the extent, but only to the extent, that such untrue statement (or alleged
untrue statement) or omission (or alleged omission) is made in such registration
statement, prospectus, offering circular or other document in reliance upon and
in conformity with written information furnished to the Company and stated to be
specifically for use therein; provided, however, that the liability and
obligations of the Holder hereunder shall be limited to any amount equal to the
gross proceeds received by the Holder of Registrable Securities sold as
contemplated therein.

            5.3 Each party entitled to indemnification under this Section 5
("Indemnified Party") shall give notice to the party required to provide
indemnification ("Indemnifying Party") promptly after such Indemnified Party has
actual knowledge of any claim as to which indemnity may be sought, and shall
permit the Indemnifying Party to assume the defense of any such claim or any
litigation resulting therefrom, provided that counsel for the Indemnifying
Party, who shall conduct the defense of such claim or any litigation resulting
therefrom shall be approved by the Indemnified Party (whose approval shall not
unreasonably be withheld). The Indemnified Party may participate in such defense
at such party's expense; provided, however, the Indemnifying Party shall bear
the expenses of such defense of the Indemnified Party (including the fees and
disbursements of one additional counsel to all Indemnified Parties which shall
be selected by the Indemnified Parties) if representation of both parties by the
same counsel would be inappropriate due to actual or potential conflicts of
interest. The omission by any Indemnified Party to give notice as provided
herein shall not relieve the Indemnifying Party of its obligations under this
Section 5 except to the extent the omission results in a failure of actual
notice to the Indemnified Party and such Indemnified Party is damaged solely as
a result of the failure to give notice. No Indemnifying Party, in the defense of
any such claim or litigation, shall, except with the consent of each Indemnified
Party, consent to entry of any judgment or enter into any settlement which does
not include as an unconditional term thereof the giving by the claimant or
plaintiff to such Indemnified Party of a release from all liability in respect
to such claim or litigation. Each

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<PAGE>   5

Indemnified Party shall furnish such information regarding itself or the claim
in question as an Indemnifying Party may reasonably request in writing and as
shall be reasonably required in connection with defense of such claim and
litigation resulting therefrom.

         If the indemnification provided for in this Section 5 is held by a
court of competent jurisdiction to be unavailable to an Indemnified Party with
respect to any loss, liability, claim, damage, or expense referred to therein,
then the Indemnifying Party, in lieu of indemnifying such Indemnified Party
hereunder, shall contribute to the amount paid or payable by such Indemnified
Party as a result of such loss, liability, claim, damage or expense in such
proportion as is appropriate to reflect the relative fault of the Indemnifying
Party on the one hand and of the Indemnified Party on the other in connection
with the statements or omissions that resulted in such loss, liability, claim,
damage, or expense as well as any other relevant equitable considerations. The
relative fault of the Indemnifying Party and of the Indemnified Party shall be
determined by reference to, among other things, whether the untrue or alleged
untrue statement of material fact or the omission to state a material fact
relates to information supplied by the Indemnifying Party or by the Indemnified
Party and the parties' relative intent, knowledge, access to information, and
opportunity to correct or prevent such statement or omission.

         Notwithstanding the foregoing, to the extent that the provisions on
indemnification and contribution contained in the underwriting agreement entered
into in connection with the underwritten public offering are in conflict with
the foregoing provisions, the provisions in the underwriting agreement shall
control.

         6. INFORMATION BY HOLDER. The Holder, if any of the Registrable
Securities are included in any Registration, shall furnish to the Company such
information regarding the Holder and the distribution proposed by the Holder as
the Company may reasonably request in writing and as shall be reasonably
required in connection with any Registration, qualification or compliance
referred to in this Agreement. Such information shall be furnished to the
Company by an instrument duly executed by the Holder and stated to be
specifically for use therein.

         7. TRANSFER OR ASSIGNMENT OF REGISTRATION RIGHTS. The rights to cause
the Company to Register securities granted under Section 2 may be transferred or
assigned by the Holder to one or more permitted transferees or assignees of at
least one-third of the total number of Registrable Securities, provided that (i)
such transfer may otherwise be effected in accordance with applicable securities
laws, (ii) the Company is given written notice by the Holder thirty (30) days
prior to said transfer or assignment, stating the name and address of each
transferee or assignee and identifying the securities with respect to which such
Registration rights are being transferred or assigned and the Company consents
to the transfer or assignment (which consent will not be unreasonably withheld),
and (iii) that the transferee or assignee of such rights assumes the obligations
of the Holder under this Agreement and executes and delivers an assumption
agreement reasonably satisfactory to the Company to that effect.

         8. "MARKET STAND-OFF" AGREEMENT. The Holder agrees, if requested by the
Company and an underwriter of Common Stock (or other securities) of the Company,
not to sell or otherwise transfer or dispose of any Common Stock. (or other
securities) of the Company held

                                       5

<PAGE>   6

by the Holder during the one hundred fifty (150) day period following the
effective date of a Registration statement of the Company filed under the
Securities Act, provided that all officers and directors of the Company enter
into similar agreements. The Company may impose stop-transfer instructions with
respect to the securities subject to the foregoing restriction until the end of
such one hundred fifty (150) day period.

         9. SUSPENSION OF REGISTRATION RIGHTS. The registration rights granted
pursuant to Sections 2 hereof shall not be exercisable by the Holder during the
period in which the Holder has the ability to sell all of the Registrable
Securities held by the Holder under Rule 144 or Rule 144A during a single ninety
(90) day period.

         10. DELAY OF REGISTRATION. The Holder shall not have any right to take
any actions to restrain, enjoin or otherwise delay any registration as the
result of any controversy that might arise with respect to the interpretation or
implementation of this Agreement.

         11. GENERAL.

            11.1 GOVERNING LAW. This agreement shall be governed in all respects
by the laws of the State of Michigan without giving effect to any conflicts of
laws principles.

            11.2. REMEDIES. Any person having rights under any provisions of
this Agreement will be entitled to enforce such rights specifically, to recover
damages caused by reason of any breach of any provision of this Agreement and to
exercise all other rights granted by law.

            11.3. ENTIRE AGREEMENT, AMENDMENTS AND WAIVERS. This Agreement
constitutes the entire agreement of the parties hereto with respect to the
subject matter hereof and supersedes all previous agreements with respect to
such subject matter. Except as otherwise provided herein, the provisions of this
Agreement may be amended in a writing signed by the Company and the Holder.

            11.4. SUCCESSORS AND ASSIGNS. All covenants and agreements in this
Agreement by or on behalf of any of the parties hereto will bind and inure to
the benefit of the respective successors and assigns of the parties hereto.

                  11.5. NOTICES AND OTHER COMMUNICATIONS. All notices and other
communications required or permitted hereunder shall be in writing and shall be
mailed by first-class mail, postage pre paid, or delivered by hand, addressed
(i) if to the Holder, at its address set forth in the preamble of this Agreement
or at such other address as the Holder shall have furnished to the Company in
writing, and (ii) if to the Company, at its address set forth at the beginning
of this Agreement, or at such other address as the Company shall have furnished
to the Holder in writing.

            11.6. TITLE AND SUBTITLES. The titles of the sections and.
paragraphs of this Agreement are for convenience of reference only and are not
to, be considered in construing this Agreement.

                                       6

<PAGE>   7

            11.7. COUNTERPARTS. This Agreement may be executed in any number of
counterparts, each of which shall be an original, but all of which together
shall constitute one instrument.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement or
caused this Agreement to be executed by their respective officers, thereunto
duly authorized, as of the day and year first above written.

                         RONALD C.  CAUSLEY,  TRUSTEE  OF
                         RONALD C.  CAUSLEY  REVOCABLE TRUST
                         DATED MARCH 14, 1990, AS AMENDED

                         By:  /s/Ronald C. Causley, Trustee
                              --------------------------------------------------
                              Ronald C. Causley, Trustee

                         NEMATRON CORPORATION

                         By:  /s/David P. Gienapp
                              --------------------------------------------------
                              David P. Gienapp
                         Its: Vice President, Finance and Administration

                                       7

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