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发明名称
Perfectionnements aux treuils pour le forage des puits profonds
摘要
申请公布号
FR706384(A)
申请公布日期
1931.06.23
申请号
FRD706384
申请日期
1930.11.25
申请人
THE NATIONAL SUPPLY COMPANY
发明人
分类号
B66D1/20
主分类号
B66D1/20
代理机构
代理人
主权项
地址
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