SIGNALLING SYSTEM AND APPARATUS,申请号CAD387165-传众专利搜索

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发明名称	SIGNALLING SYSTEM AND APPARATUS
摘要
申请公布号	CA387165(A)	申请公布日期	1940.02.27
申请号	CAD387165	申请日期
申请人	THE WESTERN UNION TELEGRAPH COMPANY	发明人	RAY HOOVER
分类号		主分类号
代理机构		代理人
主权项
地址

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