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发明名称
Drilling bit
摘要
申请公布号
US2210101(A)
申请公布日期
1940.08.06
申请号
US19390253563
申请日期
1939.01.30
申请人
REED ROLLER BIT COMPANY
发明人
STANCLIFF THOMAS H.
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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