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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
B61L23/10—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in one direction only manually operated, e.g. block arrangements
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FR396888D1908-02-071908-02-07Dispositif pour la commande magnétique des appareils sémaphoriques genre lartigues
ExpiredFR396888A
(fr)