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http://www.google.com.au/patents/US3683736?utm_source=gb-gplus-share
Patent US3683736 - ULTRASONIC PERFORATING OF A SHEET OF FILM, PAPER OR THE LIKE
ULTRASONIC PERFORATING OF A SHEET OF FILM, PAPER OR THE LIKE
Guenter H. Loose et al
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Abstract
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Description
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Patent number
: 3683736
Filing date
: 23 Dec 1970
Issue date
: 1972
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