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发明名称
Circulation ports for drill bit
摘要
申请公布号
US3099324(A)
申请公布日期
1963.07.30
申请号
US19590817570
申请日期
1959.06.02
申请人
REED ROLLER BIT COMPANY
发明人
KUCERA CLEMENT M.;DEL'HOMME DANIEL L.
分类号
E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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