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http://www.google.com/patents/US3000399?utm_source=gb-gplus-share
Patent US3000399 - LOCK PROOF TWO POSITION SPOOL VALVE
LOCK PROOF TWO POSITION SPOOL VALVE
Clayton J. Brukner et al
Overview
Abstract
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Description
Claims
Patent number
: 3000399
Filing date
: Sep 12, 1958
Issue date
: Sep 19, 1961
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