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发明名称
Drill bit and locking means
摘要
申请公布号
US3260319(A)
申请公布日期
1966.07.12
申请号
US19640374492
申请日期
1964.06.11
申请人
THE TIMKEN ROLLER BEARING COMPANY
发明人
CONOVER ROBERT E.
分类号
E21B10/62;E21B10/633
主分类号
E21B10/62
代理机构
代理人
主权项
地址
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