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发明名称
摘要
申请公布号
SU362933(A1)
申请公布日期
1972.12.30
申请号
SU19691309958
申请日期
1969.03.04
申请人
发明人
分类号
E21F13/02;B65G27/00;(IPC1-7):E21F13/02
主分类号
E21F13/02
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代理人
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