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发明名称
CIRCUMFERENTIALLY YIELDABLE ROOF-SUPPORTING ARCH
摘要
申请公布号
GB8411776(D0)
申请公布日期
1984.06.13
申请号
GB19840011776
申请日期
1984.05.09
申请人
BOCHUMER EISEN HEINTZMANN
发明人
分类号
E21D11/20;E21D11/22;(IPC1-7):E21D11/22
主分类号
E21D11/20
代理机构
代理人
主权项
地址
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