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http://www.google.co.uk/patents/US3677242?utm_source=gb-gplus-share
Patent US3677242 - AIR BLOCK PREVENTION SYSTEM
AIR BLOCK PREVENTION SYSTEM
Nat Shaye et al
Overview
Abstract
Drawings
Description
Claims
Patent number
: 3677242
Filing date
: 11 Jan 1971
Issue date
: 18 Jul 1972
Plain text
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