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发明名称
Dispositifs permettant d'imprimer aux tubes de forage un mouvement rotatif de sens alternés
摘要
申请公布号
FR977119(A)
申请公布日期
1951.03.28
申请号
FRD977119
申请日期
1942.06.27
申请人
发明人
ALLARD PIERRE
分类号
E21B3/025
主分类号
E21B3/025
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代理人
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