Electrical signaling system,申请号US19360105460-传众专利搜索

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发明名称	Electrical signaling system
摘要
申请公布号	US2154742(A)	申请公布日期	1939.04.18
申请号	US19360105460	申请日期	1936.10.14
申请人	ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY	发明人	GUNNING PERCY FRANK
分类号	H02J13/00	主分类号	H02J13/00
代理机构		代理人
主权项
地址

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