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发明名称
TETE DE ROTATION POUR COLONNE DE FORAGE
摘要
申请公布号
FR2649752(B1)
申请公布日期
1996.08.23
申请号
FR19900008890
申请日期
1990.07.12
申请人
NATIONAL OILWELL
发明人
HERMAN P. PRICE
分类号
E21B3/02;(IPC1-7):E21B19/16
主分类号
E21B3/02
代理机构
代理人
主权项
地址
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