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发明名称
Improvements in rotary drawworks for drilling oil wells and the like
摘要
申请公布号
GB343545(A)
申请公布日期
1931.02.16
申请号
GB19290035000
申请日期
1929.11.15
申请人
THE NATIONAL SUPPLY COMPANY OF DELAWARE
发明人
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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