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http://www.google.ca/patents/US3724491?utm_source=gb-gplus-share
Patent US3724491 - REMOVABLE VALVE INSULATION AND COVER
REMOVABLE VALVE INSULATION AND COVER
Kai Knudsen et al
Overview
Abstract
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Description
Claims
Patent number
: 3724491
Filing date
: 5 Apr 1971
Issue date
: 3 Apr 1973
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