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发明名称
Dragline rock scraper
摘要
申请公布号
US2129955(A)
申请公布日期
1938.09.13
申请号
US19350056758
申请日期
1935.12.30
申请人
OLSON ANDREW O
发明人
OLSON ANDREW O.
分类号
E02F3/60
主分类号
E02F3/60
代理机构
代理人
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