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发明名称
Dispositif permettant d'augmenter la portance des éléments coopérant par friction d'un soutènement de mine en fer capable de céder par fléchissement
摘要
申请公布号
FR1081284(A)
申请公布日期
1954.12.17
申请号
FRD1081284
申请日期
1953.07.11
申请人
发明人
SPODIG HEINRICH
分类号
E21D15/42
主分类号
E21D15/42
代理机构
代理人
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