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发明名称
CLAMPS AND DRILLING METHODS
摘要
申请公布号
GB8322825(D0)
申请公布日期
1983.09.28
申请号
GB19830022825
申请日期
1983.08.25
申请人
EMMETT, R;SEED, J;WALMSLEY, O
发明人
分类号
E21B19/07;E21B19/10;F16L3/08;F16L3/18
主分类号
E21B19/07
代理机构
代理人
主权项
地址
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