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发明名称
Counterboring rotary drill
摘要
申请公布号
US2703698(A)
申请公布日期
1955.03.08
申请号
US19510246990
申请日期
1951.09.17
申请人
WESTERMAN WILLIAM J B
发明人
WESTERMAN WILLIAM J. B.
分类号
E21B10/28
主分类号
E21B10/28
代理机构
代理人
主权项
地址
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