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发明名称
Portable drill rig
摘要
申请公布号
US2044878(A)
申请公布日期
1936.06.23
申请号
US19350022806
申请日期
1935.05.22
申请人
THE CLEVELAND ROCK DRILL COMPANY
发明人
CURTIS JOHN C.
分类号
E21B15/04
主分类号
E21B15/04
代理机构
代理人
主权项
地址
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