Toll supervisory operator's telephone circuit,申请号US19480067867-传众专利搜索

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发明名称	Toll supervisory operator's telephone circuit
摘要
申请公布号	US2619549(A)	申请公布日期	1952.11.25
申请号	US19480067867	申请日期	1948.12.29
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	BUCHANAN RUSSELL B.
分类号	H04M3/60	主分类号	H04M3/60
代理机构		代理人
主权项
地址

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