Improvements in or relating to variable contacts for microphones or other transducing devices suing carbon granules,申请号GB19490016757-传众专利搜索

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发明名称	Improvements in or relating to variable contacts for microphones or other transducing devices suing carbon granules
摘要
申请公布号	GB673975(A)	申请公布日期	1952.06.18
申请号	GB19490016757	申请日期	1949.06.23
申请人	GFELLER A.G. APPARATEFABRIK	发明人
分类号	H04R21/02	主分类号	H04R21/02
代理机构		代理人
主权项
地址

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