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发明名称
Drilling apparatus
摘要
申请公布号
US2288545(A)
申请公布日期
1942.06.30
申请号
US19400347716
申请日期
1940.07.26
申请人
SULLIVAN MACHINERY COMPANY
发明人
OSGOOD CHARLES F.
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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