Improvements in or relating to piezo-electric coupling devices,申请号GB19320009663-传众专利搜索

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发明名称	Improvements in or relating to piezo-electric coupling devices
摘要
申请公布号	GB379248(A)	申请公布日期	1932.08.25
申请号	GB19320009663	申请日期	1932.04.04
申请人	MARCONI'S WIRELESS TELEGRAPH COMPANY, LIMITED	发明人
分类号	H03H9/54	主分类号	H03H9/54
代理机构		代理人
主权项
地址

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