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http://www.google.com/patents/US3806829?utm_source=gb-gplus-share
Patent US3806829 - RY-A VNW
RY-A VNW
David K. Duston et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3806829
Filing date
: Apr 13, 1971
Issue date
: Apr 3, 1974
Plain text
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