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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
B61L23/08—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only
B61L23/12—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only partly operated by train
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FR370649D1906-10-201906-10-20Système de relais électrique pour la commande des appareils du block-système de voies ferrées
ExpiredFR370649A
(fr)