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发明名称
Pressure drilling head
摘要
申请公布号
US2401960(A)
申请公布日期
1946.06.11
申请号
US19420443087
申请日期
1942.05.15
申请人
THE GUIBERSON CORPORATION
发明人
PRANGER ALBERT
分类号
E21B33/08
主分类号
E21B33/08
代理机构
代理人
主权项
地址
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