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http://www.google.com/patents/US3623160?utm_source=gb-gplus-share
Patent US3623160 - TO SUMMING
TO SUMMING
Wuliamsviue; Donald G. Shuda et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3623160
Filing date
: Sep 17, 1969
Issue date
: Nov 23, 1971
Plain text
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