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http://www.google.ca/patents/US3309661?utm_source=gb-gplus-share
Patent US3309661 - SIGNAL DEVICE
SIGNAL DEVICE
J. D. KENNELLY et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3309661
Filing date
: 10 Sep 1964
Issue date
: 14 Mar 1967
Plain text
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