Improvements in telegraph circuits,申请号GB19300009639-传众专利搜索

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发明名称	Improvements in telegraph circuits
摘要
申请公布号	GB351487(A)	申请公布日期	1931.06.26
申请号	GB19300009639	申请日期	1930.03.26
申请人	CREED AND COMPANY, LIMITED;FREDERICK WILLIAM JARVIS	发明人
分类号	H01H47/00;H04L5/18;H04L25/04	主分类号	H01H47/00
代理机构		代理人
主权项
地址

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