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发明名称
ROOF SUPPORT SIDE SHIELDS EXTENDING UNIT
摘要
申请公布号
PL127544(B1)
申请公布日期
1983.11.30
申请号
PL19800225395
申请日期
1980.06.30
申请人
发明人
分类号
E21D;E21D23/00;(IPC1-7):E21D23/00
主分类号
E21D
代理机构
代理人
主权项
地址
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