Signaling device for sound powered telephone systems,申请号US19470780016-传众专利搜索

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发明名称	Signaling device for sound powered telephone systems
摘要
申请公布号	US2502824(A)	申请公布日期	1950.04.04
申请号	US19470780016	申请日期	1947.10.15
申请人	UNITED STATES INSTRUMENT CORPORATION	发明人	CLEAVELAND LE ROY A.;TOOKER FRANK H.
分类号	H04M9/00	主分类号	H04M9/00
代理机构		代理人
主权项
地址

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