Improvements in or relating to piezo-electric crystals,申请号GB19490008669-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	GB677898(A)	申请公布日期	1952.08.27
申请号	GB19490008669	申请日期	1949.03.30
申请人	HER MAJESTYS' POSTMASTER GENERAL	发明人	BECHMANN RUDOLF
分类号	H03H9/02;H03H9/17	主分类号	H03H9/02
代理机构		代理人
主权项
地址

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