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发明名称
Perfectionnements apportés aux dispositifs de soutènement pour galeries de mines
摘要
申请公布号
FR1136192(A)
申请公布日期
1957.05.10
申请号
FRD1136192
申请日期
1955.11.25
申请人
BECORIT GRUBENAUSBAU G.M.B.H.
发明人
分类号
E21D17/086
主分类号
E21D17/086
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代理人
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