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发明名称
Rock drill
摘要
申请公布号
US2309077(A)
申请公布日期
1943.01.19
申请号
US19410392317
申请日期
1941.05.07
申请人
SULLIVAN MACHINERY COMPANY
发明人
OSGOOD CHARLES F.
分类号
E21B19/084;E21B44/08
主分类号
E21B19/084
代理机构
代理人
主权项
地址
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