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发明名称
Self-erecting derrick
摘要
申请公布号
US2781108(A)
申请公布日期
1957.02.12
申请号
US19560575027
申请日期
1956.03.30
申请人
DRESSER EQUIPMENT COMPANY
发明人
SELBERG JOHN P.;GRIFFITH WILLIAM H.
分类号
E04H12/18;E21B15/00
主分类号
E04H12/18
代理机构
代理人
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地址
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