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http://www.google.com.au/patents/US3679290?utm_source=gb-gplus-share
Patent US3679290 - LIQUID CRYSTAL OPTICAL FILTER SYSTEM
LIQUID CRYSTAL OPTICAL FILTER SYSTEM
James E. Adams et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3679290
Filing date
: 6 Jan 1971
Issue date
: 1972
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