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发明名称
Perfectionnements à l'assemblage de chapeaux de soutènement dans l'exploitation demines
摘要
申请公布号
FR1031195(A)
申请公布日期
1953.06.22
申请号
FRD1031195
申请日期
1951.01.19
申请人
MU:LLER & BORGGRAFE KOMMANDIT-GESELLSCHAFT
发明人
分类号
E21D17/022;E21D17/086
主分类号
E21D17/022
代理机构
代理人
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