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发明名称
Improvements in or relating to gallery supporting frames in mines or the like
摘要
申请公布号
GB363335(A)
申请公布日期
1931.12.11
申请号
GB19300018087
申请日期
1930.06.12
申请人
VEREINIGTE STAHLWERKE AKTIENGESELLSCHAFT
发明人
分类号
E21D11/22
主分类号
E21D11/22
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