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http://www.google.ca/patents/US2927722?utm_source=gb-gplus-share
Patent US2927722 - VACUUM TYPE VALVE-EQUIPPED CONTAINERS
VACUUM TYPE VALVE-EQUIPPED CONTAINERS
Melvin R. Metzger et al
Overview
Abstract
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Description
Claims
Patent number
: 2927722
Filing date
: 10 Nov 1954
Issue date
: 8 Mar 1960
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