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http://www.google.ca/patents/US3919640?utm_source=gb-gplus-share
Patent US3919640 - LOW-PASS FILTER
LOW-PASS FILTER
Walter Simciak et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3919640
Filing date
: 8 Nov 1974
Issue date
: 1975
Plain text
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