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发明名称
Drill bit
摘要
申请公布号
US2107665(A)
申请公布日期
1938.02.08
申请号
US19350026060
申请日期
1935.06.11
申请人
REED ROLLER BIT COMPANY
发明人
HARRINGTON GEORGE G.
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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