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发明名称
Hinged base frame for portable derrick masts
摘要
申请公布号
US2660268(A)
申请公布日期
1953.11.24
申请号
US19490072796
申请日期
1949.01.26
申请人
INTERNATIONAL DERRICK & EQUIPMENT COMPANY
发明人
SELBERG JOHN P.
分类号
B66C13/18
主分类号
B66C13/18
代理机构
代理人
主权项
地址
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