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发明名称
Drilling apparatus
摘要
申请公布号
US2343319(A)
申请公布日期
1944.03.07
申请号
US19400349471
申请日期
1940.08.02
申请人
SULLIVAN MACHINERY COMPANY
发明人
PAGET WIN W.
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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