Electric phonograph resistance type pickup,申请号US19450608527-传众专利搜索

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发明名称	Electric phonograph resistance type pickup
摘要
申请公布号	US2429137(A)	申请公布日期	1947.10.14
申请号	US19450608527	申请日期	1945.08.02
申请人	ROOT JOHN J	发明人	ROOT JOHN J.
分类号	H04R21/04	主分类号	H04R21/04
代理机构		代理人
主权项
地址

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