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发明名称
Tricone rock bit
摘要
申请公布号
US2595904(A)
申请公布日期
1952.05.06
申请号
US19480025455
申请日期
1948.05.06
申请人
SECURITY ENGINEERING CO., INC.
发明人
SWART KENNETH H.
分类号
E21B10/22
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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