PSN-L Email List Message

Subject: rockland filters ebay
From: BOB BARNS roybar@........
Date: Thu, 07 Jun 2001 20:52:16 -0400

  There are two adjustable filters on ebay which may be of interest.
As best as I can tell, only 1 goes to low enough freqs. for seis work.
Search on   rockland filter

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Larry Cochrane <cochrane@..............>