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发明名称
Forepoling Apparatus
摘要
申请公布号
GB2021662(A)
申请公布日期
1979.12.05
申请号
GB19790016673
申请日期
1979.05.14
申请人
HARDING J D
发明人
分类号
E21D23/00;(IPC1-7):E21D17/02
主分类号
E21D23/00
代理机构
代理人
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