Recording system for telephone conversations,申请号US19370173302-传众专利搜索

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发明名称	Recording system for telephone conversations
摘要
申请公布号	US2165546(A)	申请公布日期	1939.07.11
申请号	US19370173302	申请日期	1937.11.08
申请人	HELLER HERMAN S	发明人	HELLER HERMAN S.
分类号	H04M1/65	主分类号	H04M1/65
代理机构		代理人
主权项
地址

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