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发明名称
Rotary bit
摘要
申请公布号
US2039551(A)
申请公布日期
1936.05.05
申请号
US19340750546
申请日期
1934.10.29
申请人
S. R. BOWEN COMPANY
发明人
PHIPPS JOHN T.
分类号
E21B10/08;E21B10/22
主分类号
E21B10/08
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代理人
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