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发明名称
Self-resetting impact device
摘要
申请公布号
GB9915918(D0)
申请公布日期
1999.09.08
申请号
GB19990015918
申请日期
1999.07.08
申请人
BUYERS, MARK;FORSYTHE, DAVID;FRASER, SIMON B
发明人
分类号
E21B31/113
主分类号
E21B31/113
代理机构
代理人
主权项
地址
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