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发明名称
PERFECTIONNEMENT AUX DISPOSITIFS DE FORAGE DES SOLS COMPRENANT UN OUTIL DE FORAGE FIXE A L'EXTREMITE D'UNE TIGE FORMEE DE DEUX TUBES CONCENTRIQUES
摘要
申请公布号
FR2597150(B1)
申请公布日期
1988.09.09
申请号
FR19860005734
申请日期
1986.04.11
申请人
BONIFACE ANDRE
发明人
分类号
E21B4/14;E21B4/20;E21B17/10;E21B17/18;E21B17/22;E21B21/12;(IPC1-7):E21B4/20
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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