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发明名称
UNDER-REAMER
摘要
申请公布号
GB1455777(A)
申请公布日期
1976.11.17
申请号
GB19740007805
申请日期
1974.02.20
申请人
CEMENTATION PILING FOUNDATIONS LTD
发明人
分类号
E21B10/32;(IPC1-7):E21B9/26
主分类号
E21B10/32
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