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http://www.google.co.uk/patents/US3812348?utm_source=gb-gplus-share
Patent US3812348 - DEVICE FOR ELECTRO-OPTICALLY ASCERTAINING HOLES IN MOVING WEBS
DEVICE FOR ELECTRO-OPTICALLY ASCERTAINING HOLES IN MOVING WEBS
Paul R. Lippke et al
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Abstract
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Description
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Patent number
: 3812348
Filing date
: 20 Nov 1972
Issue date
: 1974
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