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发明名称
Drilling bit
摘要
申请公布号
US2894727(A)
申请公布日期
1959.07.14
申请号
US19550508837
申请日期
1955.05.17
申请人
HENDERSON HOMER I
发明人
HENDERSON HOMER I.
分类号
E21B4/16;E21B10/04;E21B10/06;E21B10/16
主分类号
E21B4/16
代理机构
代理人
主权项
地址
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