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发明名称
Dispositifs d'avertissement mis en action par les oscillations lentes des rails d'un chemin de fer
摘要
申请公布号
FR38963(E)
申请公布日期
1931.08.10
申请号
FRD38963
申请日期
1930.08.28
申请人
SOCIETE D'AVERTISSEUR FERROVOIE
发明人
分类号
B61L1/06
主分类号
B61L1/06
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代理人
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