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发明名称
A METHOD OF RISING HEADING CLEANING,ESPECIALLY SHAFTS FROM THE CUMULATWD LOSS
摘要
申请公布号
PL155332(B1)
申请公布日期
1991.11.29
申请号
PL19870268050
申请日期
1987.10.02
申请人
发明人
分类号
E21D;E21D7/00;E21F16/00;E21F17/00;(IPC1-7):E21D7/00
主分类号
E21D
代理机构
代理人
主权项
地址
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