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http://www.google.co.uk/patents/US2203706?utm_source=gb-gplus-share
Patent US2203706 - METHOD OF AND APPARATUS FOR MAIN
METHOD OF AND APPARATUS FOR MAIN
Donald C. Stockbarger et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2203706
Filing date
: 5 May 1937
Issue date
: 11 Jun 1940
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