Improvements relating to prepayment devices used with telephone instruments,申请号GB19290029852-传众专利搜索

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发明名称	Improvements relating to prepayment devices used with telephone instruments
摘要
申请公布号	GB340595(A)	申请公布日期	1931.01.02
申请号	GB19290029852	申请日期	1929.10.02
申请人	SIEMENS BROTHERS & CO., LIMITED;GILBERT FARADAY DUTTON	发明人
分类号	H04M17/02	主分类号	H04M17/02
代理机构		代理人
主权项
地址

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