Improvements in secret telephone communication systems,申请号GB19380012512-传众专利搜索

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发明名称	Improvements in secret telephone communication systems
摘要
申请公布号	GB497198(A)	申请公布日期	1938.12.14
申请号	GB19380012512	申请日期	1938.04.27
申请人	STANDARD TELEPHONES AND CABLES LIMITED	发明人
分类号	H04K1/02	主分类号	H04K1/02
代理机构		代理人
主权项
地址

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