Piezo-electric phonograph pick-up,申请号US19260137129-传众专利搜索

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发明名称	Piezo-electric phonograph pick-up
摘要
申请公布号	US1761831(A)	申请公布日期	1930.06.03
申请号	US19260137129	申请日期	1926.09.22
申请人	FEDERAL TELEGRAPH COMPANY	发明人	HOUGH CLINTON W.
分类号	H04R17/00	主分类号	H04R17/00
代理机构		代理人
主权项
地址

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