Piezo-electric crystal apparatus,申请号US19280257074-传众专利搜索

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发明名称	Piezo-electric crystal apparatus
摘要
申请公布号	US1763288(A)	申请公布日期	1930.06.10
申请号	US19280257074	申请日期	1928.02.25
申请人	FEDERAL TELEGRAPH COMPANY	发明人	WORRALL ROBERT H.
分类号	H03H9/08	主分类号	H03H9/08
代理机构		代理人
主权项
地址

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