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发明名称
Traversée de voie renforcée
摘要
申请公布号
FR803376(A)
申请公布日期
1936.09.29
申请号
FRD803376
申请日期
1935.06.19
申请人
发明人
GRAND JEAN FRANCOIS EUGENE;GRAND RENE LUCIEN
分类号
E01B7/12
主分类号
E01B7/12
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代理人
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