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发明名称
Variable pressure drill feed
摘要
申请公布号
US2375991(A)
申请公布日期
1945.05.15
申请号
US19410396284
申请日期
1941.06.02
申请人
INTERNATIONAL MULTIFEED DRILLS, LTD.
发明人
HOFFAR HENRY S.
分类号
E21B19/081
主分类号
E21B19/081
代理机构
代理人
主权项
地址
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