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发明名称
摘要
申请公布号
JP2581780(Y2)
申请公布日期
1998.09.24
申请号
JP19910058340U
申请日期
1991.06.28
申请人
发明人
分类号
E21B7/00;B66C13/12;B66C23/68;B66F9/06;B66F9/08;B66F11/04;(IPC1-7):B66C13/12
主分类号
E21B7/00
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代理人
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