JOINT FILING AGREEMENT
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Exhibit
B
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The undersigned hereby
agree that the Statement on
Schedule 13G with respect to
the Common Stock of Numerex Corp. and any
further amendments thereto executed by each and any
of us shall be filed on behalf of each of us pursuant to and
in accordance with the provisions of
Rule 13d-1(k)(1) under
the Securities Exchange Act of 1934, as
amended.
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This Agreement may
be executed in separate counterparts, each of which
shall be deemed an original, but all of which shall constitute
one and the
same
instrument.
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Dated:
September 17, 2007
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By:
/s/ Xxxx X. Xxxxxxxx
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Xxxx
X. Xxxxx, Managing Member
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POTOMAC
CAPITAL MANAGEMENT INC.
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By: /s/ Xxxx
X. Xxxxx
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Xxxx
X. Xxxxx, President
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XXXX
X. XXXXX
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By: /s/
Xxxx X. Xxxxx
Xxxx
X. Xxxxx
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POTOMAC
CAPITAL PARTNERS, LP
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By: /s/
Xxxx X. Xxxxx
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Xxxx
X. Xxxxx, Managing Member of the General
Partner
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