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发明名称
Drilling apparatus
摘要
申请公布号
US2322741(A)
申请公布日期
1943.06.22
申请号
US19400349647
申请日期
1940.08.02
申请人
SULLIVAN MACHINERY COMPANY
发明人
OSGOOD CHARLES F.
分类号
E21B19/081;E21B19/086;E21B44/02
主分类号
E21B19/081
代理机构
代理人
主权项
地址
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