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经营范围
发明名称
Drill bit
摘要
申请公布号
US2279129(A)
申请公布日期
1942.04.07
申请号
US19400314027
申请日期
1940.01.16
申请人
REED ROLLER BIT COMPANY
发明人
PENNINGTON JOHN V.
分类号
E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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