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http://www.google.ca/patents/US2187408?utm_source=gb-gplus-share
Patent US2187408 - THUMIM
THUMIM
Carl F. Thumm et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 2187408
Filing date
: 3 Feb 1939
Issue date
: 16 Jan 1940
Plain text
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