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发明名称
Drilling apparatus
摘要
申请公布号
US2376974(A)
申请公布日期
1945.05.29
申请号
US19430487871
申请日期
1943.05.21
申请人
INGERSOLL-RAND COMPANY
发明人
MILLER FRANK
分类号
E21B4/00;E21B10/02;E21B21/00
主分类号
E21B4/00
代理机构
代理人
主权项
地址
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