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http://www.google.com/patents/US3008245?utm_source=gb-gplus-share
Patent US3008245 - EDUCATIONAL KIT FOR INSTRUCTION AND TESTING
EDUCATIONAL KIT FOR INSTRUCTION AND TESTING
Howard O. Meuche et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3008245
Filing date
: Oct 12, 1960
Issue date
: Nov 14, 1961
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