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发明名称
Drilling derrick
摘要
申请公布号
US2342139(A)
申请公布日期
1944.02.22
申请号
US19410392981
申请日期
1941.05.10
申请人
ECCENTRIC DERRICK, INC.
发明人
GLEASON THOMAS
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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