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发明名称
Core bit
摘要
申请公布号
US2306491(A)
申请公布日期
1942.12.29
申请号
US19400340698
申请日期
1940.06.15
申请人
REED ROLLER BIT COMPANY
发明人
NOBLE WILEY B.;SHAW JOHN F.
分类号
E21B10/06
主分类号
E21B10/06
代理机构
代理人
主权项
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