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发明名称
摘要
申请公布号
JPS58189289(U)
申请公布日期
1983.12.15
申请号
JP19820085265U
申请日期
1982.06.08
申请人
发明人
分类号
E02D7/28;E02D13/00;E21B7/00;E21B7/02;E21B10/44;(IPC1-7):E21B7/02
主分类号
E02D7/28
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