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http://www.google.com/patents/US3639686?utm_source=gb-gplus-share
Patent US3639686 - TELEVISION RECEIVER CUT-IN DEVICE
TELEVISION RECEIVER CUT-IN DEVICE
Harold R. Walker et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3639686
Filing date
: Apr 25, 1969
Issue date
: 1972
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