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发明名称
Drilling rig
摘要
申请公布号
US2919899(A)
申请公布日期
1960.01.05
申请号
US19560618818
申请日期
1956.10.29
申请人
HITCHCOCK LEO L
发明人
HITCHCOCK LEO L.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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