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发明名称
Hydraulic well drilling device
摘要
申请公布号
US2422031(A)
申请公布日期
1947.06.10
申请号
US19440540989
申请日期
1944.06.19
申请人
SHELL DEVELOPMENT COMPANY
发明人
MERTEN EUGEN
分类号
E21B6/00
主分类号
E21B6/00
代理机构
代理人
主权项
地址
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