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http://www.google.ca/patents/US3510843?utm_source=gb-gplus-share
Patent US3510843 - AUTOMATICALLY DETERMINING THE TYPES OF PER^HES
AUTOMATICALLY DETERMINING THE TYPES OF PER^HES
James Russell Bennett et al
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Abstract
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Description
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Patent number
: 3510843
Filing date
: 27 Mar 1967
Issue date
: 5 May 1970
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