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发明名称
DISPOSITIF D'ABSORPTION CONTROLEE DES FORCES AXIALES ET DE TORSION SUR UN TRAIN DE TIGES DE FORAGE
摘要
申请公布号
FR2634515(B1)
申请公布日期
1992.05.22
申请号
FR19890009894
申请日期
1989.07.21
申请人
DRILEX SYSTEMS INC
发明人
JOHN FORREST
分类号
E21B17/07;E21B44/00;(IPC1-7):E21B44/00
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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