Perfectionnements aux systèmes de communication,申请号FRD812431-传众专利搜索

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发明名称	Perfectionnements aux systèmes de communication
摘要
申请公布号	FR812431(A)	申请公布日期	1937.05.10
申请号	FRD812431	申请日期	1936.09.19
申请人	INTERNATIONAL BUSINESS MACHINES CORPORATION	发明人
分类号	H04L25/42;H04L25/49	主分类号	H04L25/42
代理机构		代理人
主权项
地址

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