Piezoelectric crystal apparatus,申请号US19460690872-传众专利搜索

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发明名称	Piezoelectric crystal apparatus
摘要
申请公布号	US2472753(A)	申请公布日期	1949.06.07
申请号	US19460690872	申请日期	1946.08.16
申请人		发明人
分类号	H01L41/18;H03H9/02;H03H9/17	主分类号	H01L41/18
代理机构		代理人
主权项
地址

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