A low sonic frequency crystal contact microphone,申请号GB19550013018-传众专利搜索

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发明名称	A low sonic frequency crystal contact microphone
摘要
申请公布号	GB798825(A)	申请公布日期	1958.07.30
申请号	GB19550013018	申请日期	1955.05.05
申请人	THE MURCHIE TRADING COMPANY LIMITED;LIONEL FOTHERGILL	发明人
分类号	A61B7/04;H04R17/02	主分类号	A61B7/04
代理机构		代理人
主权项
地址

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