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发明名称
Blade-type drill bit
摘要
申请公布号
US3191698(A)
申请公布日期
1965.06.29
申请号
US19620195595
申请日期
1962.05.17
申请人
DRILLING & SERVICE, INC.
发明人
SHORT LOT WILLIAM
分类号
E21B10/54
主分类号
E21B10/54
代理机构
代理人
主权项
地址
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