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发明名称
Dispositif automatique de signalisation sonore pour chemins de fer
摘要
申请公布号
FR737294(A)
申请公布日期
1932.12.09
申请号
FRD737294
申请日期
1932.05.19
申请人
发明人
KETTLER PAUL
分类号
B61L29/24
主分类号
B61L29/24
代理机构
代理人
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