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发明名称
ELEMENT DE COUPE POUR TREPAN DE FORAGE ROTATIF POUR FORAGES PROFONDS DANS DES FORMATIONS GEOLOGIQUES
摘要
申请公布号
BE892487(A1)
申请公布日期
1982.07.01
申请号
BE19820207567
申请日期
1982.03.12
申请人
CHRISTENSEN INC.
发明人
R. JURGENS
分类号
E21B10/56;E21B10/567;E21B10/58;(IPC1-7):E21B/
主分类号
E21B10/56
代理机构
代理人
主权项
地址
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