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发明名称
Système de colliers d'arrêt pour monter des outils sur le cuvelage d'un puits
摘要
申请公布号
FR1077825(A)
申请公布日期
1954.11.12
申请号
FRD1077825
申请日期
1953.05.26
申请人
发明人
SR. JESSE ELMER HALL,
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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