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www.google.comhttp://www.google.com/patents/US2217279?utm_source=gb-gplus-sharePatent US2217279 - ACOUSTIC APPARATUS

Patent US2217279 - ACOUSTIC APPARATUS

ACOUSTIC APPARATUS

Melvin E. Karns et al

Abstract

Overview
Abstract
Drawings
Description
Claims

Patent number: 2217279
Filing date: Jul 23, 1938
Issue date: Oct 8, 1940

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