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http://www.google.com.au/patents/US3812469?utm_source=gb-gplus-share
Patent US3812469 - SHFFT Z OF
SHFFT Z OF
Erwin A. Hauck et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3812469
Filing date
: 12 May 1972
Issue date
: 21 Nov 1974
Plain text
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