Telephone signaling system,申请号US19310544605-传众专利搜索

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发明名称	Telephone signaling system
摘要
申请公布号	US1860458(A)	申请公布日期	1932.05.31
申请号	US19310544605	申请日期	1931.06.15
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	EDWARDS WILLIAM H.
分类号	H04Q1/446	主分类号	H04Q1/446
代理机构		代理人
主权项
地址

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