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http://www.google.ca/patents/US3755810?utm_source=gb-gplus-share
Patent US3755810 - DUOCHROMATIC INDICATOR FOR A DIVERSITY
DUOCHROMATIC INDICATOR FOR A DIVERSITY
George R. Latham et al
Overview
Abstract
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Description
Claims
Patent number
: 3755810
Filing date
: 27 Feb 1957
Issue date
: 8 Aug 1973
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