Secret electric signalling system,申请号GB19380013947-传众专利搜索

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发明名称	Secret electric signalling system
摘要
申请公布号	GB504861(A)	申请公布日期	1939.05.02
申请号	GB19380013947	申请日期	1938.05.10
申请人	STANDARD TELEPHONES AND CABLES LIMITED	发明人
分类号	H03F1/54;H04K1/04	主分类号	H03F1/54
代理机构		代理人
主权项
地址

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