Exhibit 1
JOINT FILING AGREEMENT
In accordance with Rule 13d-1 (f) under the Securities Exchange Act of
1934, as amended, the undersigned hereby agree to the joint filing with all
other Reporting Entities (as such term is defined in the Schedule 13G) on behalf
of each of them of a statement on Schedule 13G (including amendments thereto)
with respect to the Common Stock, $.01 Par Value per share, of Advanced Power
Technologies, and that this Agreement be included as an Exhibit to such joint
filing. This Agreement may be executed in any number of counterparts all of
which taken together shall constitute one and the same instrument.
IN WITNESS WHEREOF, the undersigned hereby execute this
Agreement this 10th day of December, 2001.
EQSF ADVISERS, INC.
By:/s/ XXXXXX X. XXXXXXX
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Xxxxxx X. Xxxxxxx
Chairman and Chief Executive
Officer
