Exhibit B JOINT FILING AGREEMENT The undersigned hereby agree that the Statement on Schedule 13G/A, dated February 27, 2006 with respect to the shares of Class A Common Stock of Numerex Corp. and any further amendments thereto executed by each and any...Joint Filing Agreement • February 28th, 2006 • Potomac Capital Management LLC • Communications equipment, nec
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.
