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http://www.google.co.uk/patents/US3551913?utm_source=gb-gplus-share
Patent US3551913 - HEART VALVE PROSTHESIS WITH GUARD STRUCTURE
HEART VALVE PROSTHESIS WITH GUARD STRUCTURE
Donald P. Sfailey et al
Overview
Abstract
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Description
Claims
Patent number
: 3551913
Filing date
: 2 Apr 1968
Issue date
: 5 Jan 1971
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