Improvements in or relating to piezoelectric unit and method of making same,申请号GB19430021428-传众专利搜索

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发明名称	Improvements in or relating to piezoelectric unit and method of making same
摘要
申请公布号	GB577022(A)	申请公布日期	1946.05.01
申请号	GB19430021428	申请日期	1943.12.21
申请人	THE BRUSH DEVELOPMENT COMPANY	发明人
分类号	H04R17/00	主分类号	H04R17/00
代理机构		代理人
主权项
地址

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