Variable resonant frequency ultrasonic generator,申请号US19490117918-传众专利搜索

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发明名称	Variable resonant frequency ultrasonic generator
摘要
申请公布号	US2689947(A)	申请公布日期	1954.09.21
申请号	US19490117918	申请日期	1949.09.26
申请人	FRY WILLIAM J	发明人	FRY WILLIAM J.
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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