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发明名称
CAUNCH SUPPORTS
摘要
申请公布号
GB1592262(A)
申请公布日期
1981.07.01
申请号
GB19770040386
申请日期
1978.05.25
申请人
DURHAM DRILLING & ENG CO LTD
发明人
分类号
E21D19/04;(IPC1-7):E21D19/04
主分类号
E21D19/04
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