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http://www.google.ca/patents/US2190713?utm_source=gb-gplus-share
Patent US2190713 - PIEZOELECTRIC PRESSURE INDICATOR
PIEZOELECTRIC PRESSURE INDICATOR
Hans Htatie et al
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Abstract
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Description
Claims
Patent number
: 2190713
Filing date
: 17 Mar 1938
Issue date
: 20 Feb 1940
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