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经营范围
发明名称
Roof drill bit tip
摘要
A roof drill having a drill bit tip including a plurality of equally spaced, V-shaped serrations.
申请公布号
US5433281(A)
申请公布日期
1995.07.18
申请号
US19940280337
申请日期
1994.07.25
申请人
BLACK, STANTON
发明人
BLACK, STANTON
分类号
E21B10/58;(IPC1-7):E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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