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发明名称
Improvements in classifiers
摘要
申请公布号
GB687158(A)
申请公布日期
1953.02.11
申请号
GB19500008600
申请日期
1950.04.05
申请人
THE DORR COMPANY
发明人
分类号
B03B5/50
主分类号
B03B5/50
代理机构
代理人
主权项
地址
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