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经营范围
发明名称
Roller bit
摘要
申请公布号
US2244617(A)
申请公布日期
1941.06.03
申请号
US19390250955
申请日期
1939.01.14
申请人
THE NATIONAL TOOL COMPANY
发明人
HANNUM CHARLES M.
分类号
E21B10/18;E21B10/50
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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