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http://www.google.com.au/patents/US3757574?utm_source=gb-gplus-share
Patent US3757574 - APPARATUS FOR DETECTING THE ABILITY OF
APPARATUS FOR DETECTING THE ABILITY OF
Lake Oswego et al
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Abstract
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Patent number
: 3757574
Filing date
: 28 Sep 1971
Issue date
: 11 Sep 1973
Inventors
:
Lake Oswego
,
Lake Oswego
Current U.S. Classification
:
73/150.00A
;
73/159
View patent at USPTO
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