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http://www.google.com.au/patents/US3693406?utm_source=gb-gplus-share
Patent US3693406 - METHOD FOR INSPECTING FILTERS
METHOD FOR INSPECTING FILTERS
Benjamin F. Tobin et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3693406
Filing date
: 20 Jan 1971
Issue date
: 1972
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