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发明名称
Improved drilling method
摘要
申请公布号
GB9822304(D0)
申请公布日期
1998.12.09
申请号
GB19980022304
申请日期
1998.10.14
申请人
MARIS INTERNATIONAL LIMITED
发明人
分类号
主分类号
代理机构
代理人
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