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发明名称
摘要
申请公布号
DD126144(A1)
申请公布日期
1977.06.22
申请号
DD19760193249
申请日期
1976.06.08
申请人
发明人
分类号
B02C9/04;B02C17/00;(IPC1-7):B02C9/04
主分类号
B02C9/04
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代理人
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