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发明名称
Drilling accessory
摘要
申请公布号
GB9810830(D0)
申请公布日期
1998.07.22
申请号
GB19980010830
申请日期
1998.05.21
申请人
WILKINS, PAUL G;BRAIN, ROBERT G;WILKINS, DAVID G
发明人
分类号
主分类号
代理机构
代理人
主权项
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