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http://www.google.com.au/patents/US3661460?utm_source=gb-gplus-share
Patent US3661460 - USCOMM-DC
USCOMM-DC
Alan H. Elking et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3661460
Filing date
: 28 Aug 1970
Issue date
: 24 Mar 1972
Plain text
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