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http://www.google.ca/patents/US1598666?utm_source=gb-gplus-share
Patent US1598666 - SYMMETRICAL ROTATING SWITCH
SYMMETRICAL ROTATING SWITCH
LEK J. VOORHEES et al
Overview
Abstract
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Description
Claims
Patent number
: 1598666
Filing date
: 9 Dec 1921
Issue date
: 7 Sep 1926
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