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发明名称
Boring tool
摘要
申请公布号
US2234451(A)
申请公布日期
1941.03.11
申请号
US19390306699
申请日期
1939.11.29
申请人
RANSOME COMPANY
发明人
RANSOME BERNARD
分类号
E21B7/04;E21B7/26;E21B7/28;E21B10/00;E21B10/26
主分类号
E21B7/04
代理机构
代理人
主权项
地址
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