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发明名称
Drill stem feed
摘要
申请公布号
US2179316(A)
申请公布日期
1939.11.07
申请号
US19370180160
申请日期
1937.12.16
申请人
E. J. LONGYEAR COMPANY
发明人
ANDERSON OLOF B.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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