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发明名称
Improvements in drive bushings for rotary well drilling machines
摘要
申请公布号
GB354086(A)
申请公布日期
1931.08.06
申请号
GB19300026704
申请日期
1930.09.06
申请人
EDGAR EUGENE GREVE;OIL WELL SUPPLY COMPANY
发明人
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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