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发明名称
Dispositif pour l'application d'un poids à un trépan de forage
摘要
申请公布号
FR1223127(A)
申请公布日期
1960.06.15
申请号
FR19590793750
申请日期
1959.04.30
申请人
JERSEY PRODUCTION RESEARCH COMPANY
发明人
分类号
E21B44/00
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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