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发明名称
Mounting for rock drills
摘要
申请公布号
US2165853(A)
申请公布日期
1939.07.11
申请号
US19370126412
申请日期
1937.02.18
申请人
INGERSOLL-RAND COMPANY
发明人
HART DUDLEY W.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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