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http://www.google.com.au/patents/US3639037?utm_source=gb-gplus-share
Patent US3639037 - DIRECTIONAL OR REFLEXIVE PROJECTION SCREEN
DIRECTIONAL OR REFLEXIVE PROJECTION SCREEN
Yoshio Fukushima et al
Overview
Abstract
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Description
Claims
Patent number
: 3639037
Filing date
: 25 Feb 1970
Issue date
: 1972
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