Improvements relating to sound recording apparatus associated with telephone systems,申请号GB19370030645-传众专利搜索

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发明名称	Improvements relating to sound recording apparatus associated with telephone systems
摘要
申请公布号	GB509046(A)	申请公布日期	1939.07.10
申请号	GB19370030645	申请日期	1937.11.08
申请人	ALLGEMEINE ELEKTRICITAETS-GESELLSCHAFT	发明人
分类号	H04M1/65	主分类号	H04M1/65
代理机构		代理人
主权项
地址

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