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发明名称
Device for use in operating track relays in railway signaling systems
摘要
申请公布号
US2024845(A)
申请公布日期
1935.12.17
申请号
US19330702445
申请日期
1933.12.15
申请人
MICHELIN & CIE
发明人
BOURDON PIERRE MARCEL
分类号
B61L1/18
主分类号
B61L1/18
代理机构
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