13D Filing: Gerst Capital, LLC and Microwave Filter Co Inc (MFCO)

EXHIBIT A

AGREEMENT REGARDING JOINT FILING

OF STATEMENT ON SCHEDULE 13D OR 13G

The undersigned agree to file jointly with the Securities and Exchange
Commission (the “SEC”) any and all statements on Schedule 13D, Schedule 13G or forms 3, 4 or 5 (and any amendments
or supplements thereto) required under section 13(d) or 16(a) of the Securities Exchange Act of 1934, as amended, in connection
with purchases by the undersigned of the securities of any issuer. For that purpose, the undersigned hereby constitute and appoint
Gerst Capital, LLC, a Delaware limited liability company, as their true and lawful agent and attorney-in-fact, with full power
and authority for and on behalf of the undersigned to prepare or cause to be prepared, sign, file with the SEC and furnish to any
other person all certificates, instruments, agreements and documents necessary to comply with section 13(d) and section 16(a) of
the Act, in connection with said purchases, and to do and perform every act necessary and proper to be done incident to the exercise
of the foregoing power, as fully as the undersigned might or could do if personally present.

Dated: __________________