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发明名称
Procédé et dispositif d'alésage d'élargissement ou analogue de l'extrémité de trous ou puits de forage, de sondage ou d'extension pratiqués dans la terre et leursdiverses applications
摘要
申请公布号
FR1513620(A)
申请公布日期
1968.02.16
申请号
FR19670091583
申请日期
1967.01.18
申请人
发明人
WACK ELISABETH;HOCHSTRASSER JUERGEN
分类号
E21B7/28;E21B10/32;E21B11/02
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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