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发明名称
Drag bit
摘要
申请公布号
US2830794(A)
申请公布日期
1958.04.15
申请号
US19550489506
申请日期
1955.02.21
申请人
MILLS MACHINE COMPANY
发明人
MILLS EDWARD O.
分类号
E21B10/42;E21B10/43;E21B10/54
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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