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发明名称
DISPOSITIF D'OUVERTURE POUR TIGES DE FORAGE
摘要
申请公布号
FR2588914(B1)
申请公布日期
1989.12.22
申请号
FR19860014588
申请日期
1986.10.21
申请人
TAMPELLA AB OY
发明人
JARMO LEPPANEN
分类号
E21B19/16;(IPC1-7):E21B19/16;E21B17/10
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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