Document:

Exhibit 10.24

 

EQUIPMENT LINE OF CREDIT NOTE (NON-REVOLVING)

 

1.           DEFINED
TERMS. As used in this Equipment Line of Credit Note (this "Note"), the following terms shall have the meanings
there indicated:

 

	 	1.1	Borrower:	Dynasil Corporation of America
	 	 	 	a Delaware corporation
	 	 	 	313 Washington Street, Suite 403
	 	 	 	Newton, MA 01760
	 	 	 	 
	 	1.2	Lender:	Middlesex Savings Bank 
	 	 	 	a Massachusetts savings bank
	 	 	 	6 Main Street
	 	 	 	Natick, MA 01760
	 	 	 	 
	 	1.3	Conversion Date:	April 30, 2019, or as extended by the Lender in writing.
	 	 	 	 
	 	1.4	Maturity Date:	April 30, 2019, or as extended by the Lender in writing.
	 	 	 	 
	 	1.6	Credit Agreement:	a certain Loan and Security Agreement dated May 1, 2014, by and between Borrower and Lender, as amended.
	 	 	 	 
	 	1.7	Equipment Loan Commitment:	Seven Hundred Fifty Thousand ($750,000.00) Dollars

 

2.           DEBT.
For value received, the Borrower hereby promises to pay to the order of Lender the principal sum equal to the Equipment Loan
Commitment, or so much as has been advanced by Lender from time to time pursuant to the Credit Agreement and is outstanding, together
with interest on all unpaid balances from the date hereof at the interest rate set forth in this Note, together with all other
amounts due hereunder or under the Loan Documents. All advances under this Note shall be made in accordance with the terms of the
Credit Agreement. This Note evidences a non-revolving equipment line of credit loan, such that, prior to the Conversion Date, the
Borrower may from time to time, request Advances under the Note so long as the outstanding aggregate Advances hereunder do not
exceed the Equipment Loan Commitment. All capitalized terms used, but not otherwise defined, herein shall have the meanings set
forth in the Credit Agreement.

 

3.            INTEREST.
The outstanding principal balance under this Note shall accrue interest (the “Interest Rate”) as follows:

 

		(i)	from the date of this Note until the Conversion Date, interest shall accrue at a fluctuating per
annum rate of interest equal to the Prime Rate (as defined below), and

 

		(ii)	from the Conversion Date until the Maturity Date, interest shall accrue at a fixed per annum rate
of interest equal to FHLBB plus two and one half (2.50%) percent.

 

    	 

     

    

 

The “Prime Rate” shall
mean the variable per annum rate of interest announced on a daily basis as the Prime Rate by the Wall Street Journal (or a similar
publication as chosen by the holder of this Note if the Wall Street Journal ceases publication). If the Wall Street Journal publishes
more than one Prime Rate, the Prime Rate for purposes of this Loan shall be the higher or highest of the published rates. Changes
in the Interest Rate resulting from changes in the Prime Rate shall take place immediately without notice to Borrower or demand
of any kind.

 

"FHLBB" shall mean the
Federal Home Loan Bank 5/5 Amortizing Advance Rate. If at any time prior to the Conversion Date, FHLBB has been discontinued or
revised or is otherwise unavailable, FHLBB as revised or such other government index or computation with which it is replaced,
or which is based on comparable information, shall be selected by Lender in order to obtain substantially the same results as would
have been obtained if FHLBB had not been discontinued, revised or rendered unavailable.

 

Interest on the outstanding principal balance
under this Note shall at all times be calculated on a 360-day year and shall accrue and be payable on the actual number of days
elapsed.

 

4.
           PAYMENTS. (i) Commencing from the date of this Note until the Conversion Date,
the Borrower shall make, on the ___ day of each month commencing on September___, 2018 (each a “Payment Date”),
monthly payments of interest only based on the outstanding principal balance of the Note, and (ii) commencing from the Conversion
Date until the Maturity Date, the Borrower shall make on each Payment Date combined monthly payments of principal and interest
based upon a sixty (60) month amortization schedule such that this Note shall be fully amortized by the Maturity Date. All
outstanding principal, interest and any other amounts, fees or charges due under this Note or under the Credit Agreement (collectively,
the “Obligations”) shall be immediately due and payable on the Maturity Date or on such earlier date as may
be required under the terms of this Note or any of the other Loan Documents. Any payments on this Note, whether such payment is
a regular installment, represents a prepayment (if permitted hereunder) or is the result of acceleration of this Note by Lender,
shall be made in coin and currency of the United States of America which is legal tender for the payment of public and private
debts, in immediately available funds, to Lender at the address set forth above or at such other address as the Lender may from
time to time designate in writing.

 

Payments received by
the Lender prior to the occurrence of an Event of Default (as defined in the Credit Agreement) will be applied first to
fees, expenses and other amounts due hereunder or under the Credit Agreement (excluding principal and interest); second,
to accrued interest under this Note; and third to the outstanding principal due under this Note; after the occurrence of
an Event of Default, payments will be applied to the Obligations as the Lender determines in its sole discretion.

 

5.            SECURITY.
This Note is secured by a first priority security interest in all assets of the Borrower, pursuant to the Credit Agreement. Such
Credit Agreement, together with all documents, guarantees, filings and certificates, whether securing this Note or used in connection
thereto (the terms and provisions of all of which are incorporated herein by reference), as the same may be amended from time to
time are hereinafter referred to as the "Loan Documents".

 

6.            LATE
CHARGE. Whenever any amount of principal and interest due under this Note shall not be paid within ten (10) days of its due
date, whether by acceleration or otherwise, the Borrower shall pay to Lender, in addition to such payments, a delinquency or “late”
charge equal to five percent (5%) of such past due amount. The Borrower agrees that any such delinquency charges shall not be deemed
to be additional interest or penalty, but shall be deemed to be liquidated damages because of the difficulty in computing the actual
amount of damages in advance.

 

    	-2-

     

    

 

7.            DEFAULT.
Any Event of Default under the Credit Agreement or any of the Loan Documents (beyond any applicable grace or cure period, if any)
shall constitute an Event of Default under this Note including, without limitation, any failure of Borrower to make any payments
of principal, interest or other charges when due. Upon the occurrence of an Event of Default, the Lender may, at its option, (i)
declare without notice or demand to Borrower the unpaid principal and all accrued interest and other charges under this Note to
be immediately due and payable without presentment, demand, protest, notice of protest or other notice of dishonor of any kind,
all of which are hereby expressly waived, and (ii) proceed to exercise any rights or remedies that it may have under the Loan Documents
or such other rights and remedies which the Lender may have at law, equity, or otherwise. No course of dealing or delay in accelerating
the maturity of this Note or in taking any other action with respect to any Event of Default shall affect Lender’s rights
to take action with respect thereto, and no waiver as to any one Event of Default shall affect any of Lender’s rights as
to any other Event of Default.

 

8.            SETOFF.
The Borrower hereby grants to the Lender a security interest in any deposits or other sums at any time credited by or due from
the holder of this Note to the Borrower or Guarantor, and in any securities or other property of Borrower or Guarantor in the possession
or custody of the holder of this Note and such deposits, sums, securities and/or property may at all times be held and treated
as collateral security for the payment of this Note and any and all other liabilities, direct or indirect, absolute or contingent,
due or to become due, now existing or hereafter arising, of Borrower or Guarantor to the holder. The holder hereof may apply such
deposits or other sums to said Obligations at any time from and after an Event of Default hereunder, whether or not other collateral
is available to the Lender, without demand or prior notice, all of which are hereby expressly waived.

 

9.            DEFAULT
RATE. Upon the occurrence of an Event of Default, at the Lender’s option, the Borrower shall, in addition to any other
payment due hereunder, pay interest on the outstanding principal balance under this Note from and after the date on which such
Event of Default has occurred at a per annum interest rate equal to the greater of (i) six percent (6.0%) per annum above the Interest
Rate otherwise payable hereunder, or (ii) eighteen percent (18%) (the “Default Rate”).

 

10.          COLLECTION
COSTS. After the occurrence of an Event of Default, in addition to principal, interest and delinquency charges, the Lender
shall be entitled to collect and the Borrower and Guarantor agree to pay, all costs and expenses of collection, including court
costs and reasonable attorneys’ fees and expenses, incurred in connection with the protection or realization of collateral
or in connection with the Lender’s exercise of any rights under the Loan Documents, whether or not suit on this Note is filed,
and all such costs and expenses shall be payable on demand and until paid shall also be secured by the Loan Documents.

 

11.          PREPAYMENT.
The Borrower may prepay the outstanding principal balance under this Note, in whole or in part, without payment of premium or penalty,
at any time prior to the Maturity Date.

 

12.        COMMERCIAL
LOAN. The Borrower hereby attests, certifies, represents, warrants and covenants that the indebtedness evidenced by this Note
arose from the use of proceeds for commercial and business purposes only and this representation has been relied upon by the Note
holder hereof.

 

    	-3-

     

    

 

13.        WAIVER.
THE BORROWER AND GUARANTOR, AND ANY OTHER PERSON NOW OR HEREAFTER LIABLE FOR THE PAYMENT OF ANY OF THE INDEBTEDNESS EVIDENCED BY
THIS NOTE IRREVOCABLY WAIVE ANY RIGHTS TO NOTICE AND HEARING TO THE EXTENT PERMITTED BY STATE OR FEDERAL LAW WITH RESPECT TO ANY
PREJUDGMENT REMEDY WHICH LENDER MAY DESIRE TO USE, and, by making, guaranteeing or endorsing this Note or by making any agreement
to pay any of the indebtedness evidenced by this Note, further, irrevocably waives presentment for payment, protest and demand,
notice of protest, demand and or dishonor and nonpayment of this Note and all other notices in connection with the delivery, acceptance,
performance, default or enforcement of the payment of this Note, and consents without notice or further assent: (a) to the substitution,
exchange or release of the collateral securing this Note or any part thereof at any time; (b) to the acceptance by the holder or
holders at any time of any additional collateral or security for or other guarantors of this Note; (c) to the modification or amendment
at any time, and from time to time of this Note, and any other Loan Document at the request of any person liable hereon; (d) to
the granting by the holder hereof of any extension of the time for payment of this Note or for the performance of the agreements,
covenants and conditions contained in this Note, or any other Loan Document, at the request of any other person liable hereon;
and (e) to any and all forbearances and indulgences whatsoever; and such consent shall not alter or diminish the liability of any
person.

 

14.         JURY
TRIAL WAIVER. BORROWER, LENDER AND ANY GUARANTOR MUTUALLY HEREBY KNOWINGLY, VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO
A TRIAL BY JURY IN RESPECT OF ANY LITIGATION BASED ON THIS NOTE, ARISING OUT OF, UNDER OR IN CONNECTION WITH THE LOAN DOCUMENTS
CONTEMPLATED TO BE EXECUTED IN CONNECTION HEREWITH, OR ANY COURSE OF CONDUCT, COURSE OF DEALINGS, STATEMENTS (WHETHER VERBAL OR
WRITTEN) OR ACTIONS OF ANY PARTY. THIS WAIVER CONSTITUTES A MATERIAL INDUCEMENT FOR BORROWER AND LENDER TO ENTER INTO THE TRANSACTIONS
CONTEMPLATED HEREBY.

 

15.         NO
USURY. The Lender and the Borrower intend to comply at all times with applicable usury laws. If at any time such laws would
ever render usurious any amounts called for under this Note or the other Loan Documents, then it is the Borrower’s and the
Lender’s express intention that neither the Borrower nor any guarantor shall be required to pay interest on this Note at
a rate in excess of the maximum lawful rate, that the provisions of this section shall control over all other provisions of this
Note which may be in apparent conflict herewith, that such excess amount shall be credited to the principal balance of this Note
(or, if this Note has been fully paid, refunded by the Lender to the Borrower), and the provisions hereof shall be reformed and
the amounts thereafter collectible under this Note reduced, without the necessity of the execution of any further documents, so
as to comply with the then applicable law, but so as to permit the recovery by Lender of the fullest amount otherwise called for
under this Note. The term “applicable usury laws” as used in this Note shall mean the laws of The Commonwealth of Massachusetts
or the laws of the United States, whichever laws allow the greater rate of interest, as such laws now exist or may be changed or
amended or come into effect in the future.

 

16.        GOVERNING
LAW; JURISDICTION; SERVICE OF PROCESS. This Note shall take effect as a sealed instrument and shall in all respects be governed,
construed, applied and enforced in accordance with the internal laws of the Commonwealth of Massachusetts without regard to principles
of conflicts of law. Borrower and Guarantor hereby consent to venue and personal jurisdiction in any state or Federal court located
within the Commonwealth of Massachusetts and waives any and all personal rights under the law of any other state to object to jurisdiction
within such Commonwealth for the purposes of litigation to enforce such obligations of the Borrower. In the event such litigation
is commenced, the Borrower agrees that service of process may be made, and personal jurisdiction over the Borrower obtained, by
service of a copy of the summons, complaint and other pleadings required to commence such litigation upon the Borrower at the addresses
set forth in Section 1 of this Note.

 

    	-4-

     

    

 

17.         JOINT
AND SEVERAL LIABILITY. The liabilities of the Borrower and each Guarantor of this Note are joint and several; provided, however,
the release by Lender of any one or more Borrower or any one or more Guarantor shall not release any other Borrower or Guarantor
obligated on account of this Note. Each reference in this Note to Borrower and any Guarantor is to such Person individually and
also to all such Persons jointly. No Person obligated on account of this Note may seek contribution from any other Person also
obligated unless and until all liabilities to Lender from the Person from whom contribution is sought have been satisfied in full.

 

18.          SEVERABILITY.
The invalidity of any provision of this Note shall in no way affect the validity of any other provision.

 

19.          SUCCESSORS
AND ASSIGNS; AMENDMENTS. This Note shall be binding upon Borrower and upon its successors and assigns and shall inure to the
benefit of Lender and its successors, endorsees, and assigns. This Note may be changed or amended only by an agreement in writing
signed by the party against whom enforcement is sought.

 

20.         RESTATEMENT.
This Note replaces that certain Equipment Line of Credit Master Note (Non-Revolving) of dated May 16, 2017 in the maximum principal
amount of One Million and 00/100 ($1,000,000.00) Dollars, (the “Original Note”) made by the Borrower payable
to the Lender, the outstanding principal balance of which (plus any interest accrued thereon and legal fees in connection therewith),
having been converted to term debt pursuant to that certain Equipment Line of Credit Term Note from Borrower to Lender in the original
principal amount of Seven Hundred Fifty Two Thousand Five Hundred Forty Three and 15/100 ($752,543.15) Dollars, dated July 31,
2018. The Lender does not intend for the substitution of this Note for the Original Note to constitute, nor shall such be deemed
to constitute, satisfaction of the outstanding indebtedness under the Original Note, and the substitution of this Note for the
Original Note shall in no event impair, limit, reduce, or otherwise discharge the Borrower or any guarantor of the outstanding
obligations under the Original Note.

 

[Signature Page to Follow]

 

    	-5-

     

    

 

IN WITNESS WHEREOF,
the Borrower has executed this Note as an instrument under seal as of the 13th day of August, 2018.

 

	 	 	DYNASIL CORPORATION OF AMERICA
	 	 	 
	/s/ Patricia M. Kehe	 	By:	/s/ Robert Bowdring
	Witness	 	 	Robert Bowdring, Chief Financial Officer

 

[Signature Page to $750,000.00 Equipment
Line of Credit Note]

 

    	-6-Exhibit 10.25

 

AMENDMENT

 

TO

 

NOTE PURCHASE AGREEMENT 

 

This Amendment to the
Note Purchase Agreement, dated as of July 31, 2012, as amended, (this “Amendment”), is entered into as of November
27, 2018 (subject to the satisfaction of the conditions set forth in Section 3 below, the “Effective Date”),
by and between Dynasil Corporation of America, a Delaware corporation (the “Company”), and Massachusetts Capital
Resource Company (the “Purchaser”).

 

WITNESSETH:

 

WHEREAS, the
Company and the Purchaser are parties to that certain Note Purchase Agreement, dated as of July 31, 2012, (as amended to date and
as amended hereby and as may be further amended, restated, supplemented or otherwise modified from time to time, the “Purchase
Agreement”);

 

WHEREAS, pursuant
to the Purchase Agreement the Company issued and sold to the Purchaser the Company’s Note in the original outstanding principal
amount of $3,000,000 (the “Note”);

 

WHEREAS, the
Company has requested the Purchaser to amend certain provisions of the Purchase Agreement and the Note; and

 

WHEREAS, the
Purchaser is willing to make such amendments, all on the terms and subject to the conditions set forth herein;

 

NOW, THEREFORE,
in consideration of the foregoing and for other good and valid consideration, the receipt and sufficiency of which are hereby acknowledged,
the parties hereto, intending to be legally bound, hereby agree as follows:

 

		1.	Defined Terms. Capitalized terms used but not defined herein shall have the respective meanings
ascribed to such terms in the Purchase Agreement.

 

		2.	Amendment to Purchase Agreement and Notes. Upon satisfaction of the conditions to effectiveness
set forth in Section 3 below:

 

(a)          As
of and from the Effective Date of this Amendment, all references in the Purchase Agreement, and all exhibits thereto, to the Notes
being “due 2019” are hereby amended to read “due 2021”. Further, all references in the Purchase Agreement,
and all exhibits thereto, to the Notes being due on “July 31, 2019” are hereby amended to read “November 30,
2021”.

 

    	 

     

    

 

(b)         As
of and from the Effective Date of this Amendment, Section 1.04(a) of the Purchase Agreement is amended in its entirety to read
as follows:

 

“(a) Required Redemptions.
Beginning on and with December 31, 2019, and on the last day of each calendar month thereafter through and including November 30,
2021, the Company will redeem, without premium, $36,041.66 in principal amount of the Notes, or such lesser amount as may be then
outstanding, together with all accrued and unpaid interest then due on the amount so redeemed. On the stated or accelerated maturity
of the Notes, the Company will pay the principal amount of the Notes then outstanding together with all accrued and unpaid interest
then due thereon. No optional redemption of less than all of the Notes shall affect the obligation of the Company to make the redemptions
required by this subsection.”

 

(c)          As
of and from the Effective Date of this Amendment, all references in the Notes to being “due 2019” are hereby amended
to read “due 2021”. Further, all references in the Notes to being due on “July 31, 2019” are hereby amended
to read “November 30, 2021”.

 

		3.	Conditions. The effectiveness of this Amendment is subject to the following conditions:

 

(a)       the
execution and delivery of this Amendment by the Company and the Purchaser;

 

(b)       Middlesex
Savings Bank shall have consented to this Amendment and the provisions contained herein;

 

(c)       the
execution of the acknowledgement of this Amendment by each guarantor whose name appears at the end of this Amendment;

 

(d)       the
Purchaser shall have received a certificate of the Company certifying certified copies of all documents evidencing other necessary
corporate or other action and governmental approvals, if any, with respect to this Amendment and the Note; and

 

(e)       the
Company shall have paid the Purchaser all fees, costs and expenses of the Purchaser in connection with this Amendment, including,
without limitation, reasonable fees, costs and expenses of counsel.

 

		4.	Representations and Warranties. The Company hereby represents and warrants to the Purchaser
as follows:

 

(a)       the
Company is a corporation, duly organized, validly existing and in good standing under the laws of the jurisdiction of its formation;

 

(b)       the
Company has the power and authority to execute, deliver and perform its obligations under this Amendment, the Purchase Agreement
and the Note;

 

    	2

     

    

  

(c)       the
execution, delivery and performance by the Company of this Amendment, the Purchase Agreement and the Note have been duly authorized
by all necessary corporate action and does not and will not require any registration with, consent or approval of, notice to or
action by, any Person (including any governmental agency);

 

(d)       this
Amendment, the Purchase Agreement, the Note, and any other loan documents executed in connection herewith and therewith (the “Loan
Documents”) to which the Company or any of its subsidiaries or affiliates is a party, as each Loan Document is amended
by this Amendment, constitute the legal, valid and binding obligation of the Company and such subsidiaries and affiliates, enforceable
against such person in accordance with its terms;

 

(e)       after
giving effect to this Amendment, (i) no Event of Default exists or shall exist under the Purchase Agreement, and (ii) no event
of default exists or shall exist under the Company’s or any of its subsidiaries’ or affiliates’ loan agreements
with any bank or financial institution;

 

(f)       after
giving effect to this Amendment, all representations and warranties by the Company contained in the Purchase Agreement and the
Note are true and correct in all material respects as of the date hereof, except to the extent made as of a specific date, in which
case each such representation and warranty shall be true and correct as of such date; and

 

(g)       by
its signature below, the Company agrees that it shall constitute an Event of Default if any representation or warranty made herein
is untrue or incorrect in any material respect as of the date when made or deemed made.

 

		5.	Agreement in Full Force and Effect as Amended. Except as specifically amended hereunder,
the Purchase Agreement, the Note, and other Loan Documents shall remain in full force and effect and are hereby ratified and confirmed
as so amended. Except as expressly set forth herein, this Amendment shall not be deemed to be a waiver, amendment or modification
of any provisions of the Purchase Agreement or any other Loan Document or any right, power or remedy of the Purchaser, nor constitute
a waiver of any provision of the Purchase Agreement or any other Loan Document, or any other document, instrument and/or agreement
executed or delivered in connection therewith or of any Event of Default under any of the foregoing, in each case, whether arising
before or after the date hereof or as a result of performance hereunder or thereunder. This Amendment also shall not preclude the
future exercise of any right, remedy, power, or privilege available to the Purchaser whether under the Purchase Agreement, the
Note, the other Loan Documents, at law or otherwise and nothing contained herein shall constitute a course of conduct or dealing
among the parties hereto. All references to the Purchase Agreement shall be deemed to mean the Purchase Agreement as amended hereby.
This Amendment shall not constitute a novation or satisfaction and accord of the Purchase Agreement and/or other Loan Documents,
but shall constitute an amendment thereof. The parties hereto agree to be bound by the terms and conditions of the Purchase Agreement,
the Note, and Loan Documents as amended by this Amendment, as though such terms and conditions were set forth herein. Each reference
in the Purchase Agreement to “this Agreement,” “hereunder,” “hereof,” “herein”
or words of similar import shall mean and be a reference to the Purchase Agreement as amended by this Amendment, and each reference
herein or in any other Loan Document to the “Purchase Agreement” shall mean and be a reference to the Purchase Agreement
as amended and modified by this Amendment.

 

    	3

     

    

 

		6.	Counterparts. This Amendment may be executed by one or more of the parties to this Amendment
and any number of separate counterparts, each of which when so executed, shall be deemed an original and all said counterparts
when taken together shall be deemed to constitute but one and the same instrument.

 

		7.	Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of
the Company and its successors and assigns and the Purchaser and its successors and assigns.

 

		8.	Further Assurance. The Company hereby agrees from time to time, as and when requested by
the Purchaser, to execute and deliver or cause to be executed and delivered, all such documents, instruments and agreements and
to take or cause to be taken such further or other action as the Purchaser may reasonably deem necessary or desirable in order
to carry out the intent and purposes of this Amendment, the Purchase Agreement, the Note, and the Loan Documents.

 

		9.	GOVERNING LAW. THIS AMENDMENT SHALL BE GOVERNED BY AND SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH THE INTERNAL LAWS OF THE COMMONWEALTH OF MASSACHUSETTS, WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES.

 

		10.	Severability. Wherever possible, each provision of this Amendment shall be interpreted in
such manner as to be effective and valid under applicable law, but if any provision of this Amendment shall be prohibited by or
invalid under such law, such provision shall be ineffective to the extent of such prohibition or invalidity without invalidating
the remainder of such provision or the remaining provisions of this Amendment.

 

[Remainder of Page Intentionally Left Blank;
Signature Page Follows]

 

    	4

     

    

 

IN WITNESS WHEREOF,
each of the undersigned has executed this Amendment as of the date set forth above.

 

	 	DYNASIL CORPORATION OF AMERICA
	 	 
	 	By	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Chief Financial Officer
	 	 
	 	MASSACHUSETTS CAPITAL RESOURCE 
	 	COMPANY
	 	 
	 	By:  	/s/ Suzanne L. Dwyer
	 	 	Suzanne L. Dwyer, Managing Director

 

Each
of the undersigned, hereby agrees to the foregoing changes and hereby confirms its Unconditional Guaranty, dated July 31, 2012
as amended, issued by the undersigned in favor of Massachusetts Capital Resource Company.

 

	 	DYNASIL BIOMEDICAL CORPORATION
	 	 
	 	By:	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Treasurer
	 	 
	 	EVAPORATED METAL FILMS CORPORATION
	 	 
	 	By:	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Treasurer
	 	 
	 	OPTOMETRICS CORPORATION
	 	 
	 	By:	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Treasurer
	 	 
	 	RADIATION MONITORING DEVICES, INC.
	 	 
	 	By:	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Treasurer
	 	 
	 	RMD INSTRUMENTS CORPORATION
	 	 
	 	By:	/s/ Robert J. Bowdring 
	 	 	Robert J. Bowdring, Treasurer

 

 

[Signature Page to the Amendment to Note
Purchase Agreement]

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