Pressure-compensated telephone unit,申请号US19450581689-传众专利搜索

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发明名称	Pressure-compensated telephone unit
摘要
申请公布号	US2505519(A)	申请公布日期	1950.04.25
申请号	US19450581689	申请日期	1945.03.08
申请人	THE UNITED STATES OF AMERICA AS REPRESENTED BY THE EXECUTIVE SECRETARY OF THE OFFICEOF SCIENTIFIC RESEARCH AND DEVELOPMENT	发明人	BERANEK LEO L.
分类号	H04R1/22;H04R13/02	主分类号	H04R1/22
代理机构		代理人
主权项
地址

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