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发明名称
Three-cutter bit
摘要
申请公布号
US2044549(A)
申请公布日期
1936.06.16
申请号
US19310558295
申请日期
1931.08.20
申请人
HUGHES TOOL COMPANY
发明人
SCOTT FLOYD L.
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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