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发明名称
Rotary bit
摘要
申请公布号
US1859947(A)
申请公布日期
1932.05.24
申请号
US19250054875
申请日期
1925.09.08
申请人
UNIVERSAL ENGINEERING COMPANY
发明人
ZUBLIN JOHN A.
分类号
E21B10/08
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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