Telephone set circuit,申请号US19420434372-传众专利搜索

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发明名称	Telephone set circuit
摘要
申请公布号	US2332643(A)	申请公布日期	1943.10.26
申请号	US19420434372	申请日期	1942.03.12
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	JOHNSON KENNETH S.
分类号	H04M1/58	主分类号	H04M1/58
代理机构		代理人
主权项
地址

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