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发明名称
摘要
申请公布号
JPH0710501(U)
申请公布日期
1995.02.14
申请号
JP19930045102U
申请日期
1993.07.27
申请人
发明人
分类号
E21B4/14;F15B1/00;(IPC1-7):F15B1/00
主分类号
E21B4/14
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