Piezoelectric crystal and means for and method of controlling its frequency response characteristics,申请号US19480022597-传众专利搜索

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发明名称	Piezoelectric crystal and means for and method of controlling its frequency response characteristics
摘要
申请公布号	US2551848(A)	申请公布日期	1951.05.08
申请号	US19480022597	申请日期	1948.04.22
申请人	PARKER BILLY E	发明人	PARKER BILLY E.
分类号	G01H13/00;H03C3/10	主分类号	G01H13/00
代理机构		代理人
主权项
地址

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