Improvements in or relating to piezo-electric crystals,申请号GB19300010199-传众专利搜索

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发明名称	Improvements in or relating to piezo-electric crystals
摘要
申请公布号	GB351940(A)	申请公布日期	1931.06.30
申请号	GB19300010199	申请日期	1930.03.31
申请人	ELECTRICAL RESEARCH PRODUCTS INC.	发明人
分类号	H03H3/04;H03H9/19	主分类号	H03H3/04
代理机构		代理人
主权项
地址

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