Perfectionnements aux installations télégraphiques duplex,申请号FRD702328-传众专利搜索

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发明名称	Perfectionnements aux installations télégraphiques duplex
摘要
申请公布号	FR702328(A)	申请公布日期	1931.04.03
申请号	FRD702328	申请日期	1930.09.17
申请人	CREED AND COMPANY, LIMITED	发明人
分类号	H04L5/14	主分类号	H04L5/14
代理机构		代理人
主权项
地址

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