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发明名称
MECHANIZED HEADING ROOF SUPPORT
摘要
申请公布号
PL131447(B1)
申请公布日期
1984.11.30
申请号
PL19810231797
申请日期
1981.06.19
申请人
发明人
分类号
E21D;E21D11/12;E21D19/04;(IPC1-7):E21D19/04
主分类号
E21D
代理机构
代理人
主权项
地址
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