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发明名称
Portable derrick
摘要
申请公布号
US2296186(A)
申请公布日期
1942.09.15
申请号
US19410391973
申请日期
1941.05.05
申请人
VON ROSENBERG HERBERT J
发明人
ROSENBERG HERBERT J. VON
分类号
B66C23/48
主分类号
B66C23/48
代理机构
代理人
主权项
地址
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