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发明名称
Verbetering van of met betrekking tot het dak in steenkolenmynen of andere ondergrondsche werken
摘要
申请公布号
BE463527(A)
申请公布日期
1946.06.29
申请号
BED463527
申请日期
1944.11.20
申请人
BEIJL ZAKO
发明人
分类号
E21D11/00
主分类号
E21D11/00
代理机构
代理人
主权项
地址
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