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发明名称
Working platform for derrick masts
摘要
申请公布号
US2291055(A)
申请公布日期
1942.07.28
申请号
US19420437401
申请日期
1942.04.02
申请人
FRANKS MANUFACTURING CORPORATION
发明人
ORTLOFF JOHN E.
分类号
E04H12/00;E21B19/14
主分类号
E04H12/00
代理机构
代理人
主权项
地址
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