Selective signaling system,申请号US19470758904-传众专利搜索

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发明名称	Selective signaling system
摘要
申请公布号	US2589806(A)	申请公布日期	1952.03.18
申请号	US19470758904	申请日期	1947.07.03
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	HICKMAN CLARENCE N.
分类号	G06M1/02;G06M1/10;H01H67/22;H03K23/74	主分类号	G06M1/02
代理机构		代理人
主权项
地址

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