Telephone trunk supervisory signalling system,申请号US19540470722-传众专利搜索

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发明名称	Telephone trunk supervisory signalling system
摘要
申请公布号	US2814674(A)	申请公布日期	1957.11.26
申请号	US19540470722	申请日期	1954.11.23
申请人	SIEMENS EDISON SWAN LIMITED	发明人	STALLWORTHY FRANK ALLEN;HICKS PERCY WILLIAM
分类号	H04Q1/446;H04Q3/00	主分类号	H04Q1/446
代理机构		代理人
主权项
地址

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