Perfectionnements aux systèmes télégraphiques électriques,申请号FRD693955-传众专利搜索

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发明名称	Perfectionnements aux systèmes télégraphiques électriques
摘要
申请公布号	FR693955(A)	申请公布日期	1930.11.27
申请号	FRD693955	申请日期	1930.01.30
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H04L5/18	主分类号	H04L5/18
代理机构		代理人
主权项
地址

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