Electrical signaling system,申请号US19430473273-传众专利搜索

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发明名称	Electrical signaling system
摘要
申请公布号	US2490038(A)	申请公布日期	1949.12.06
申请号	US19430473273	申请日期	1943.01.22
申请人	INTERNATIONAL STANDARD ELECTRIC CORPORATION	发明人	VRIENDT CHARLES DE;CABES LUCIEN A. B.
分类号	H04Q1/446;H04Q3/00	主分类号	H04Q1/446
代理机构		代理人
主权项
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