Improvements relating to telephone systems,申请号GB19460026219-传众专利搜索

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发明名称	Improvements relating to telephone systems
摘要
申请公布号	GB625276(A)	申请公布日期	1949.06.24
申请号	GB19460026219	申请日期	1946.08.30
申请人	SIEMENS BROTHERS & CO. LIMITED;RONALD ISAAC HERBERT CLARK;FRANK ALLEN STALLWORTHY	发明人
分类号	H04M3/523	主分类号	H04M3/523
代理机构		代理人
主权项
地址

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