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www.google.comhttp://www.google.com/patents/US3071237?utm_source=gb-gplus-sharePatent US3071237 - POWELL Patent US3071237 - POWELL

Patent US3071237 - POWELL

POWELL

B. L. POWELL et al

Abstract

Overview
Abstract
Drawings
Description
Claims

Patent number: 3071237
Filing date: Jan 30, 1961
Issue date: Jan 1, 1963

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