Piezoelectric crystal unit,申请号US19440519069-传众专利搜索

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发明名称	Piezoelectric crystal unit
摘要
申请公布号	US2497680(A)	申请公布日期	1950.02.14
申请号	US19440519069	申请日期	1944.01.19
申请人	THE BRUSH DEVELOPMENT COMPANY	发明人	MASSA FRANK
分类号	B06B1/06	主分类号	B06B1/06
代理机构		代理人
主权项
地址

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