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发明名称
摘要
申请公布号
SU547229(A1)
申请公布日期
1977.02.25
申请号
SU19752113724
申请日期
1975.03.18
申请人
发明人
分类号
B02C21/02;B02C23/04;(IPC1-7):B02C21/02
主分类号
B02C21/02
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代理人
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