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经营范围
发明名称
Drilling apparatus
摘要
申请公布号
US2212067(A)
申请公布日期
1940.08.20
申请号
US19390262888
申请日期
1939.03.20
申请人
REED ROLLER BIT COMPANY
发明人
HOFFOSS JOHN E.
分类号
E21B10/26
主分类号
E21B10/26
代理机构
代理人
主权项
地址
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