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经营范围
发明名称
Extensible mast derrick
摘要
申请公布号
US3100625(A)
申请公布日期
1963.08.13
申请号
US19610106311
申请日期
1961.04.28
申请人
BACK CARL F
发明人
BACK CARL F.
分类号
B66C23/36;B66C23/693;E21B15/00
主分类号
B66C23/36
代理机构
代理人
主权项
地址
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