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发明名称
Interchangeable post construction for derricks
摘要
申请公布号
US1834421(A)
申请公布日期
1931.12.01
申请号
US19290335806
申请日期
1929.01.29
申请人
EMSCO-DERRICK & EQUIPMENT COMPANY
发明人
RAWSON LESLIE A.
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
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