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发明名称
Rotary drag bit
摘要
申请公布号
US2119661(A)
申请公布日期
1938.06.07
申请号
US19370129603
申请日期
1937.03.08
申请人
WHALEN JOSEPH J
发明人
WHALEN JOSEPH J.
分类号
E21B11/06
主分类号
E21B11/06
代理机构
代理人
主权项
地址
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