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发明名称
UNDERWATER PIEZOELECTRIC ARRANGEMENT
摘要
申请公布号
EP0174897(A3)
申请公布日期
1987.04.08
申请号
EP19850420164
申请日期
1985.09.11
申请人
NGK SPARK PLUG CO. LTD.
发明人
BANNO, HISAO
分类号
G01V1/20;H01L41/087;H04R17/00;(IPC1-7):H04R17/00
主分类号
G01V1/20
代理机构
代理人
主权项
地址
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