Electrical signaling system,申请号US19390307217-传众专利搜索

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发明名称	Electrical signaling system
摘要
申请公布号	US2230937(A)	申请公布日期	1941.02.04
申请号	US19390307217	申请日期	1939.12.02
申请人	AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED	发明人	CORNER ARTHUR CHARLES
分类号	H04J1/06	主分类号	H04J1/06
代理机构		代理人
主权项
地址

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