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http://www.google.com/patents/US3216423?utm_source=gb-gplus-share
Patent US3216423 - APPARATUS FOR FACILITATING THE BIRTH OF A CHILD BY CENTRIFUGAL FORCE
APPARATUS FOR FACILITATING THE BIRTH OF A CHILD BY CENTRIFUGAL FORCE
G. B. BLONSKY et al
Overview
Abstract
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Description
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Patent number
: 3216423
Filing date
: Jan 15, 1963
Issue date
: 1965
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