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发明名称
Drilling bit
摘要
申请公布号
US2634105(A)
申请公布日期
1953.04.07
申请号
US19490129331
申请日期
1949.11.25
申请人
HANS GRUNER
发明人
GRUNER HANS
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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