Telephone substation coupler for conversation recording,申请号US19470790663-传众专利搜索

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发明名称	Telephone substation coupler for conversation recording
摘要
申请公布号	US2531203(A)	申请公布日期	1950.11.21
申请号	US19470790663	申请日期	1947.12.09
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	GALBREATH ROBERT R.
分类号	H04M1/656	主分类号	H04M1/656
代理机构		代理人
主权项
地址

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