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发明名称
Drilling apparatus
摘要
申请公布号
US2109828(A)
申请公布日期
1938.03.01
申请号
US19360116789
申请日期
1936.12.19
申请人
THE GUIBERSON CORPORATION
发明人
OWEN JACK COMPTON
分类号
E21B3/04;E21B19/10
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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