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发明名称
Suuriläpimittainen hydraulinen poraiskulaite
摘要
申请公布号
FI915107(A0)
申请公布日期
1991.10.30
申请号
FI19910005107
申请日期
1991.10.30
申请人
DAILEY PETROLEUM SERVICES CORP.
发明人
EVANS, ROBERT W.
分类号
E21B4/14;E21B31/113;(IPC1-7):E21B/
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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