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发明名称
Perfectionnements apportés aux dispositifs de soutènement de toits de mine, ou de souterrains ou analogues, comportant au moins un boulon d'ancrage
摘要
申请公布号
FR1222640(A)
申请公布日期
1960.06.10
申请号
FR19590784292
申请日期
1959.01.17
申请人
发明人
PIERRARD JEAN
分类号
E21D21/00;F16B43/02
主分类号
E21D21/00
代理机构
代理人
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地址
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