Document:

REVOLVING NOTE

$17,500,000.00                                                  McLean, Virginia
                                                                   June 11, 1997

      FOR VALUE RECEIVED, United Industrial Corporation, AAI Corporation, AAI
Engineering Support, Inc., AAI Systems Management, Inc., AAI/ACL Technologies,
Inc., Detroit Stoker Company, Midwest Metallurgical Laboratory, Inc., Neo
Products Co., Symtron Systems, Inc., AAI MICROFLITE Simulation International
Corporation and UIC- Del. Corporation (collectively, the "Borrower"), having an
address at c/o United Industrial Corporation, 18 E. 48th Street, New York, N.Y.
10017, promises to pay to the order of First Union Commercial Corporation, a
North Carolina corporation (the "Lender"), the principal sum of Seventeen
Million, Five Hundred Thousand Dollars ($17,500,000.00) (the "Principal Sum"),
or so much thereof as has been or may be advanced or readvanced to or for the
account of the Borrower pursuant to the terms and conditions of the Credit
Agreement (as hereinafter defined), together with interest thereon at the rate
or rates hereinafter provided, in accordance with the following terms:

      1. Interest. Commencing as of the date hereof and continuing until
repayment in full of all sums due hereunder, the unpaid Principal Sum shall bear
interest at a fluctuating rate, determined as follows:

            (a) Prime Rate Option. The initial interest rate hereunder shall be
      the Lender's "Prime Rate", being that rate announced by the Lender from
      time to time as being its Prime Rate, in its sole discretion. Changes in
      the Prime Rate will be effective, without prior notice, as of the date any
      change is announced. The Prime Rate is a reference rate only; it is not
      necessarily the most favorable rate of interest that the Lender charges to
      any borrower or class of borrowers. However, if the ratio of the
      Borrower's Senior Debt (hereinafter defined) to EBITDA (hereinafter
      defined) equals or exceeds 1.25 to 1.00 as of any "Determination Date"
      (hereafter defined), the interest rate under the Prime Rate Option shall,
      from the day after that Determination Date through the next Determination
      Date, be equal to the sum of (i) the Prime Rate in effect from time to
      time; plus (ii) one quarter of one percent (0.25%).

            (b) LIBOR Rate Option. The Borrower may elect to have interest
      accrue at the LIBOR-Based Rate (hereinafter defined). The LIBOR-Based Rate
      shall be the sum of: (i) the "LIBOR Rate" (hereinafter defined), plus (ii)
      the applicable LIBOR Margin (hereinafter defined).

      The LIBOR Rate is the annual percentage rate of interest equal to the
      London Interbank Offered Rate for corresponding deposits of United States
      dollars for "Interest Periods" of one (1), two (2), three (3) or six (6)
      months. Absent manifest error, the Lender's certificate to the Borrower
      stating the LIBOR Rate for each Interest Period shall be conclusive.
<PAGE>

      The LIBOR Margin shall be: (a) 1.50%, if the ratio of the Borrower's
      Senior Debt to EBITDA does not exceed 0.75 to 1.00 as of most recent
      Determination Date (hereinafter defined); (b) 1.65%, if the ratio of the
      Borrower's Senior Debt to EBITDA equals or exceeds 0.75 to 1.00 but is
      less than or equal to 1.25 to 1.00 as of the most recent Determination
      Date; and (c) 2.00%, if the ratio of the Borrower's Senior Debt to EBITDA
      exceeds 1.25 to 1.00 as of the most recent Determination Date. The LIBOR
      Margin will adjust on the first day after each Determination Date.

      The Borrower shall have the right to select the LIBOR Rate Option and the
      Interest Period by written notice to the Lender three days prior to the
      commencement of the proposed Interest Period; in the absence of an
      election by the Borrower of the LIBOR Rate Option, the Prime Rate Option
      shall apply. The LIBOR-Based Rate may be elected only for increments of
      principal in integral multiples of $100,000.00. Subject to the conditions
      and terms set forth herein, Borrower may elect to have the LIBOR-Based
      Rate apply to a portion of the outstanding principal balance and the Prime
      Rate apply to the remaining unpaid principal balance. The LIBOR-Based Rate
      election need not be made on a Determination Date. The Borrower may have
      no more than three LIBOR-Based Rate elections in effect at any time.

For purposes of determining any adjustment in the interest rate, the
"Determination Date" is the last day of each calendar quarter. Senior Debt and
EBITDA shall have the meanings ascribed to them in the Credit Agreement
(hereinafter defined).

All interest payable under the terms of this Note shall be calculated on the
basis of a per diem rate, calculated on a 360-day year, applied to the actual
number of days elapsed.

      2. Payments and Maturity. The unpaid Principal Sum, together with interest
thereon at the rate or rates provided above, shall be payable as follows:

      (a) With respect to interest accruing at the Prime Rate, interest only
shall be due and payable quarterly, commencing on the first day of the first
calendar quarter after the date of this Note, and on the first day of each
succeeding calendar quarter.

      (b) With respect to interest accruing at the LIBOR Rate, interest only
shall be due and payable on the earlier of (i) the first day following the end
of each Interest Period, or (ii) the first day following the end of each
calendar quarter.

      (c) Unless sooner paid, the unpaid Principal Sum, together with all
interest accrued and unpaid thereon, and all other amounts owing under this Note
shall be due and payable in full on June 11, 2000 (the "Maturity Date"). If the
Credit Agreement provides for the Borrower to make additional payments on
account of the Principal Sum

                                       2
<PAGE>

from time to time, Borrower promises to make those payments at the time and in
the manner specified in the Credit Agreement.

This Note secures advances and readvances under the Credit Agreement. This Note
will continue in full force and effect and will evidence Borrower's obligation
to repay such advances and readvances notwithstanding that the principal amount
outstanding under the Credit Agreement and evidenced by this Note may be reduced
to zero from time to time.

      3. Default Interest. Upon the occurrence of an Event of Default (as
hereinafter defined), the unpaid Principal Sum shall bear interest thereafter,
until the Event of Default is cured, at a rate of two percent (2.0%) per annum
in excess of the rate or rates of interest that would otherwise be in effect
under this Note.

      4. Late Charges. If the Borrower fails to make any payment under the terms
of this Note within ten (10) days after the date such payment is due, the
Borrower shall pay to the Lender on demand a late charge equal to five percent
(5.0%) of such payment.

      5. Application and Place of Payments. All payments, made on account of
this Note shall be applied first to the payment of accrued and unpaid interest
then due hereunder, second to the unpaid principal sum and the remainder, if
any, shall be applied to any other amounts which may remain owing hereunder. All
payments on account of this Note shall be paid in lawful money of the United
States of America in immediately available funds during regular business hours
of the Lender at its office at 1970 Chain Bridge Road, McLean, Virginia 22102,
or at such other times and places as the Lender may at any time and from time to
time designate in writing to the Borrower.

      6. Credit Agreement. This Note is the "Revolving Note" described in a
Revolving Line of Credit Loan Agreement, Term Loan Agreement and Security
Agreement of even date herewith by and between the Borrower and the Lender (the
"Credit Agreement"). The indebtedness evidenced by this Note is included within
the meaning of the term "Debt" as defined in the Credit Agreement. The term
"Loan Documents" as used in this Note shall have the meaning
ascribed to that term in the Credit Agreement. Capitalized terms used in this
Note but not defined herein have the meanings ascribed to them in the Credit
Agreement.

      7. Security. This Note is secured by the Collateral, the Real Estate
Collateral and certain other collateral described in the Credit Agreement.

      8. Events of Default. The occurrence of any one or more of the following
events shall constitute an event of default (individually, an "Event of Default"
and collectively, the "Events of Default") under this Note:

            (a) The failure of the Borrower to pay to the Lender when due any

                                       3
<PAGE>

amount payable by the Borrower to the Lender under the terms of this Note; or

            (b) The occurrence of an event of default under any of the other
Loan Documents.

      9. Remedies. Upon the occurrence of an Event of Default, at the option of
the Lender, all principal, accrued interest and other sums payable by the
Borrower to the Lender under the terms of this Note shall become immediately due
and payable, and the Lender shall have all of the rights, powers, and remedies
available under the terms of this Note, any of the other Loan Documents and all
applicable laws. The Borrower and all endorsers hereby jointly and severally
waive presentment, protest and demand, notice of protest, notice of demand and
of dishonor and non-payment of this Note and expressly agree that this Note or
any payment hereunder may be extended from time to time without in any way
affecting the liability of the Borrower or any endorsers.

      10. Expenses. The Borrower promises to pay to the Lender on demand by the
Lender all costs and expenses incurred by the Lender in connection with the
collection and enforcement of this Note, including, without limitation, all
attorneys' fees and expenses and all court costs.

      11. Notices. Any notice, request, or demand to or upon the Borrower or the
Lender shall be deemed to have been properly given or made when delivered in
accordance with the Credit Agreement.

      12. Miscellaneous. Each right, power, and remedy of the Lender as provided
for in this Note or any of the other Loan Documents, or now or hereafter
existing under any applicable law or otherwise shall be cumulative and
concurrent and shall be in addition to every other right, power, or remedy
provided for in this Note or any of the other Loan Documents or now or hereafter
existing under any applicable law, and the exercise or beginning of the exercise
by the Lender of any one or more of such rights, powers, or remedies shall not
preclude the simultaneous or later exercise by the Lender of any or all such
other rights, powers, or remedies. No failure or delay by the Lender to insist
upon the strict performance of any term, condition, covenant, or agreement of
this Note or any of the other Loan Documents, or to exercise any right, power,
or remedy consequent upon a breach thereof, shall constitute a waiver of any
such term, condition, covenant, or agreement or of any such breach, or preclude
the Lender from exercising any such right, power, or remedy at a later time or
times. By accepting payment after the due date of any amount payable under the
terms of this Note, the Lender shall not be deemed to waive the right either to
require prompt payment when due of all other amounts payable under the terms of
this Note or to declare an Event of Default for the failure to effect such
prompt payment of any such other amount. No course of dealing or conduct shall
be effective to amend, modify, waive, release, or change any provisions of this
Note.

                                       4
<PAGE>

      13. Partial Invalidity. If any term or provision of this Note or the
application thereof to any person or circumstance shall be invalid or
unenforceable to any extent, the remainder of this Note and the application of
such term or provision to persons or circumstances other than those as to which
it is held invalid or unenforceable, shall not be affected thereby, and each
term and provision of this Note shall be valid and be enforceable to the fullest
extent permitted by law.

      14. Captions. The captions herein set forth are for convenience only and
shall not be deemed to define, limit, or describe the scope or intent of this
Note.

      15. Governing Law. The provisions of this Note shall be construed,
interpreted and enforced in accordance with the laws of the Commonwealth of
Virginia (excluding Virginia's choice of law rules).

      16. Consent to Jurisdiction. Provisions of the Credit Agreement concerning
the Borrower's consent to the jurisdiction of state and federal courts sitting
in the Commonwealth of Virginia are incorporated into this Note by reference and
shall have the same force and effect as if fully set forth in this Note.

      17. Waiver of Trial by Jury. Provisions of the Credit Agreement concerning
the Borrower's and Lender's mutual waiver of trial by jury in disputes between
the Borrower and the Lender are incorporated into this Note by reference and
shall have the same force and effect as if fully set forth in this Note.

      18. Arbitration. Provisions of the Credit Agreement specifying that
certain disputes between the Borrower and the Lender shall be resolved by
binding arbitration are incorporated into this Note by reference and shall have
the same force and effect as if fully set forth in this Note.

      19. Joint and Several Liability; Notices to Borrower. The liability under
this Note of the persons comprised by the term Borrower shall be joint and
several. References in this Note to the Borrower shall refer to each such person
or to all of them as the context may require. Any notice that the Lender
provides to United Industrial Corporation in accordance with the Credit
Agreement shall be deemed to have been given to all of the persons comprised by
the term Borrower.

                                       5
<PAGE>

      IN WITNESS WHEREOF, the Borrower has caused this instrument to be executed
by duly authorized officer or officers as of the date first written above.

                                          UNITED INDUSTRIAL CORPORATION

                                          By: /s/ James H. Perry
                                             ---------------------------------
                                             James H. Perry
                                             Treasurer and Chief
                                                Financial Officer

                                          AAI CORPORATION

                                          By: /s/ Paul J. Michaud
                                             ---------------------------------
                                             Paul J. Michaud
                                             Vice President, Chief
                                                Financial Officer and
                                                Treasurer

                                          AAI ENGINEERING SUPPORT, INC.

                                          By: /s/ Paul J. Michaud
                                             ---------------------------------
                                             Paul J. Michaud
                                             Vice President, Chief
                                                Financial Officer and
                                                Treasurer

                                       6
<PAGE>

                                          AAI SYSTEMS MANAGEMENT, INC.

                                          By: /s/ Paul J. Michaud
                                             ---------------------------------
                                             Paul J. Michaud
                                             Vice President, Chief
                                                Financial Officer and
                                                Treasurer

                                          AAI/ACL TECHNOLOGIES, INC.

                                          By: /s/ Paul J. Michaud
                                             ---------------------------------
                                             Paul J. Michaud
                                             Vice President, Chief
                                                Financial Officer

                                          DETROIT STOKER COMPANY

                                          By: /s/ James H. Perry
                                             ---------------------------------
                                             James H. Perry
                                             Vice President

                                          MIDWEST METALLURGICAL
                                          LABORATORY, INC.

                                          By: /s/ James H. Perry
                                             ---------------------------------
                                             James H. Perry
                                             Vice President

                                          NEO PRODUCTS CO.

                                          By: /s/ James H. Perry
                                             ---------------------------------
                                             James H. Perry
                                             Vice President

                                       7
<PAGE>

                                          SYMTRON SYSTEMS, INC.

                                          By: /s/ James Perry
                                             ---------------------------------
                                              James Perry
                                              Chief Financial Officer

                                          UIC-Del. CORPORATION

                                          By: /s/ Paul J. Michaud
                                             ---------------------------------
                                             Paul J. Michaud
                                             President

                                          AAI MICROFLITE SIMULATION
                                          INTERNATIONAL CORPORATION

                                          By: /s/ Paul J. Michaud
                                             ---------------------------
                                             Paul J. Michaud
                                             President

                                       8SECOND AMENDMENT
                                TO REVOLVING NOTE

      THIS SECOND AMENDMENT TO REVOLVING NOTE ("Second Amendment"), made as of
November 14, 2000, by and among United Industrial Corporation, a Delaware
corporation, having an address of 570 Lexington Avenue, New York, New York
10022, and AAI Corporation, AAI Engineering Support, Inc., AAI/ACL Technologies,
Inc., AAI/ACL Technologies Europe Limited, Detroit Stoker Company, Midwest
Metallurgical Laboratory, Inc., UIC Products Co., and AAI MICROFLITE Simulation
International Corporation (collectively, the "Borrower"), and First Union
Commercial Corporation, a North Carolina Corporation (the "Lender").

                                    RECITALS

      A.    United Industrial Corporation and certain of its subsidiaries
            entered into a Revolving Note, dated as of June 11, 1997, in the
            maximum principal amount of Seventeen Million, Five Hundred Thousand
            Dollars ($17,500,000.00) made payable to the order of First Union
            Commercial Corporation, as amended by First Amendment to Revolving
            Note, dated March 31, 2000 (the "Revolving Note").

      B.    The Revolving Note evidences Borrower's obligations to repay
            advances of principal made by the Lender under a Revolving Line of
            Credit Loan Agreement And Security Agreement, dated June 11, 1997,
            as amended by First Amendment to Revolving Line of Credit Loan
            Agreement and Security Agreement dated as of October 1, 1998, by
            Second Amendment to Revolving Line of Credit Loan Agreement and
            Security Agreement dated as of December 31, 1998, by Third Amendment
            to Revolving Line of Credit Loan Agreement, Term Loan Agreement and
            Security Agreement, made as of March 31, 2000, by Fourth Amendment
            to Revolving Line of Credit Loan Agreement and Security Agreement,
            dated as of September 21, 2000, and by Fifth Amendment to Revolving
            Line of Credit Loan Agreement and Security Agreement, of even date
            herewith (the "Loan Agreement"). The Revolving Note is governed, in
            part, by certain provisions of the Loan Agreement.

      C.    The Borrower and the Lender desire to amend the Revolving Note for
            the purpose of extending the Maturity Date (as defined in the
            Revolving Note) to June 30, 2001, for the purpose of changing the
            definition of "Borrower" to the definition set forth above and for
            certain other purposes hereinafter set forth.

                                   AGREEMENTS

      NOW, THEREFORE, in consideration of the premises, the mutual agreements
herein contained, and other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the Borrower and the Lender hereby
agree as follows:
<PAGE>

1.    Capitalized terms used in this First Amendment but not defined herein have
      the meanings ascribed to them in the Revolving Note. The term "Borrower"
      shall henceforth refer to the Persons encompassed by the term "Borrower"
      as defined above.

2.    The Maturity Date is extended to and including June 30, 2001.

3.    Except as modified by this Second Amendment, the Revolving Note remains in
      full force and effect and unmodified. Borrower warrants and represents
      that it has no offsets or defenses to its obligations under the Revolving
      Note, as modified by this Second Amendment.

4.    In consideration of Lender's agreement to this Second Amendment, the
      Borrower hereby releases and waives any and all claims of any kind that it
      may have against the Lender as of the date of this First Amendment arising
      out of or relating to the Loan Agreement or the Revolving Note, as amended
      by this Second Amendment.

5.    ARBITRATION. UPON DEMAND OF ANY PARTY HERETO, WHETHER MADE BEFORE OR AFTER
      INSTITUTION OF ANY JUDICIAL PROCEEDING, ANY CONTROVERSY OR CLAIM ARISING
      OUT OF OR RELATING TO THE LOAN DOCUMENTS BETWEEN PARTIES HERETO (A
      "DISPUTE") SHALL BE RESOLVED BY BINDING ARBITRATION CONDUCTED UNDER AND
      GOVERNED BY THE COMMERCIAL FINANCIAL DISPUTES ARBITRATION RULES (THE
      "ARBITRATION RULES") OF THE AMERICAN ARBITRATION ASSOCIATION ("AAA") AND
      THE FEDERAL ARBITRATION ACT. DISPUTES MAY INCLUDE, WITHOUT LIMITATION,
      TORT CLAIMS, COUNTERCLAIMS, A DISPUTE AS TO WHETHER A MATTER IS SUBJECT TO
      ARBITRATION, CLAIMS BROUGHT AS CLASS ACTIONS, OR CLAIMS ARISING FROM
      DOCUMENTS EXECUTED IN THE FUTURE. A JUDGMENT UPON THE AWARD MAY BE ENTERED
      IN ANY COURT HAVING JURISDICTION. NOTWITHSTANDING THE FOREGOING, THIS
      ARBITRATION PROVISION DOES NOT APPLY TO DISPUTES UNDER OR RELATED TO SWAP
      AGREEMENTS. ALL ARBITRATION HEARINGS SHALL BE CONDUCTED IN THE CITY OR
      COUNTY WHERE THE LENDER'S OFFICE, AS FIRST STATED ABOVE, IS LOCATED, OR AT
      SUCH OTHER PLACE AS THE PARTIES MAY IN WRITING AGREE. A HEARING SHALL
      BEGIN WITHIN 90 DAYS OF DEMAND FOR ARBITRATION AND ALL HEARINGS SHALL
      CONCLUDE WITHIN 120 DAYS OF DEMAND FOR ARBITRATION. THESE TIME LIMITS MAY
      NOT BE EXTENDED UNLESS A PARTY SHOWS CAUSE FOR EXTENSION AND THEN FOR NO
      MORE THAN A TOTAL OF 60 DAYS. THE EXPEDITED PROCEDURES SET FORTH IN RULE
      51, ET SEQ., OF THE ARBITRATION RULES SHALL APPLY TO DISPUTES ------- IN
      WHICH THE CLAIM IS LESS THAN $1,000,000.00. ARBITRATORS SHALL BE LICENSED
      ATTORNEYS SELECTED FROM THE COMMERCIAL FINANCIAL DISPUTE ARBITRATION PANEL
      OF THE AAA. THE PARTIES DO NOT WAIVE

                                       2
<PAGE>

      APPLICABLE FEDERAL OR STATE SUBSTANTIVE LAW EXCEPT AS PROVIDED HEREIN.
      NOTWITHSTANDING THE PRECEDING BINDING ARBITRATION PROVISIONS, THE PARTIES
      AGREE TO PRESERVE WITHOUT DIMINUTION, CERTAIN REMEDIES THAT ANY PARTY MAY
      EXERCISE BEFORE OR AFTER AN ARBITRATION PROCEEDING IS BROUGHT. THE PARTIES
      SHALL HAVE THE RIGHT TO PROCEED IN ANY COURT OF PROPER JURISDICTION OR BY
      SELF HELP TO EXERCISE OR PROSECUTE THE FOLLOWING REMEDIES, AS APPLICABLE:
      (1) ALL RIGHTS TO FORECLOSE AGAINST ANY REAL OR PERSONAL PROPERTY OR OTHER
      SECURITY BY EXERCISING A POWER OF SALE OR UNDER APPLICABLE LAW BY JUDICIAL
      FORECLOSURE INCLUDING A PROCEEDING TO CONFIRM THE SALE; (2) ALL RIGHTS OF
      SELF HELP, INCLUDING WITHOUT LIMITATION, PEACEFUL OCCUPATION OF REAL
      PROPERTY AND COLLECTION OF RENTS, SETOFF, AND PEACEFUL POSSESSION OF
      PERSONAL PROPERTY; (3) OBTAINING PROVISIONAL OR ANCILLARY REMEDIES
      INCLUDING INJUNCTIVE RELIEF, SEQUESTRATION, GARNISHMENT, ATTACHMENT,
      APPOINTMENT OF RECEIVER AND FILING AN INVOLUNTARY BANKRUPTCY PROCEEDING;
      AND (4) WHEN APPLICABLE, A JUDGMENT BY CONFESSION OF JUDGMENT. ANY CLAIM
      OR CONTROVERSY WITH REGARD TO ANY PARTY'S ENTITLEMENT TO SUCH REMEDIES IS
      A DISPUTE. THE PARTIES AGREE THAT THEY SHALL NOT HAVE A REMEDY OF PUNITIVE
      OR EXEMPLARY DAMAGES AGAINST OTHER PARTIES IN ANY DISPUTE, AND THEY HEREBY
      WAIVE ANY RIGHT OR CLAIM TO PUNITIVE OR EXEMPLARY DAMAGES THEY MAY NOW
      HAVE OR WHICH MAY ARISE IN THE FUTURE IN CONNECTION WITH ANY DISPUTE
      WHETHER THE DISPUTE IS RESOLVED BY ARBITRATION OR JUDICIALLY.

6.    Lender has executed this Second Amendment for the sole purpose of
      evidencing its consent hereto, and not for the purpose of becoming liable
      on the Revolving Note as a co- maker, endorser or guarantor.

7.    This Second Amendment may be signed in several counterparts which, when
      executed, shall constitute a single agreement. A counterpart containing a
      facsimile signature shall be effective to the same extent as if it were a
      counterpart containing an original signature, but shall be confirmed
      promptly with a counterpart containing an original signature.

BORROWER:                           UNITED INDUSTRIAL CORPORATION

                                    By  /s/ James Perry
                                       --------------------------------
                                          James Perry, Vice President

                                       3
<PAGE>

                                    AAI CORPORATION

                                    By: /s/ James Perry
                                       --------------------------------
                                          James Perry, Vice President

                                    AAI ENGINEERING SUPPORT, INC.

                                    By: /s/ Richard Erkeneff
                                       --------------------------------
                                          Richard Erkeneff, President

                                    AAI/ACL TECHNOLOGIES, INC.

                                    By: /s/ Thomas E. Wurzel
                                       --------------------------------
                                          Thomas E. Wurzel, President

                                    AAI/ACL TECHNOLOGIES EUROPE LIMITED

                                    By: /s/ Thomas E. Wurzel
                                       --------------------------------
                                          Thomas E. Wurzel, President

                                    DETROIT STOKER COMPANY

                                    By: /s/ James Perry
                                       --------------------------------
                                          James Perry, Vice President

                                    MIDWEST METALLURGICAL LABORATORY,
                                    INC.

                                    By: /s/ James Perry
                                       --------------------------------
                                          James Perry, Vice President

                                       4
<PAGE>

                                    UIC PRODUCTS CO.

                                    By: /s/ James Perry
                                       --------------------------------
                                          James Perry, Vice President

                                    AAI MICROFLITE Simulation International
                                    Corporation

                                    By: Stanley J. Mecinski, Jr.
                                       --------------------------------
                                          Stanley J. Mecinski, Jr.
                                          Assistant Secretary and Assistant
                                          Treasurer

CONSENTED TO:                       FIRST UNION COMMERCIAL CORPORATION

                                    By: /s/ Scott Santa Cruz
                                       --------------------------------
                                          Scott Santa Cruz, Vice President

STATE OF MARYLAND        )
COUNTY/CITY OF BALTIMORE ) To Wit:

      I Nancy K. Yates-Miller, a Notary Public in and for the jurisdiction
aforesaid, do certify that James Perry, whose name is signed to the writing
above, bearing date as of November 13, 2000, has acknowledged the same before me
in my jurisdiction aforesaid.

      Given under my hand and seal this 13th day of November, 2000.

                                          /s/ Nancy K. Yates-Miller
                                          -------------------------
                                          Notary Public

My Commission Expires: October 31, 2001

                                       5
<PAGE>

STATE OF MARYLAND        )
COUNTY/CITY OF BALTIMORE ) To Wit:

      I Nancy K. Yates-Miller, a Notary Public in and for the jurisdiction
aforesaid, do certify that Richard Erkeneff, whose name is signed to the writing
above, bearing date as of November 13, 2000 has acknowledged the same before me
in my jurisdiction aforesaid.

      Given under my hand and seal this 13th day of November, 2000.

                                          /s/ Nancy K. Yates-Miller
                                          -------------------------
                                          Notary Public

My Commission Expires: October 31, 2001

STATE OF MARYLAND        )
COUNTY/CITY OF BALTIMORE ) To Wit.

      I Nancy K. Yates-Miller, a Notary Public in and for the jurisdiction
aforesaid, do certify that Thomas E. Wurzel, President, whose name is signed to
the writing above, bearing date as of November 13, 2000, has acknowledged the
same before me in my jurisdiction aforesaid.

      Given under my hand and seal this 13th day of November, 2000.

                                          /s/ Nancy K. Yates-Miller
                                          -------------------------
                                          Notary Public

My Commission Expires: October 31, 2001

STATE OF MARYLAND        )
COUNTY/CITY OF BALTIMORE ) To Wit

      I Nancy K. Yates-Miller, a Notary Public in and for the jurisdiction
aforesaid, do certify that Stanley J. Mecinski, Jr., whose name is signed to the
writing above, bearing date as of November 13, 2000 has acknowledged the same
before me in my jurisdiction aforesaid.

      Given under my hand and seal this 13th day of November, 2000.

                                          /s/ Nancy K. Yates-Miller
                                          -------------------------
                                          Notary Public

My Commission Expires: October 31, 2001

                                      6

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