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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
B61L23/22—Control, warning or like safety means along the route or between vehicles or trains for controlling traffic in two directions over the same pair of rails
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FR322165D1902-06-161902-06-16Dispositif de signalisation automatique pour chemins de fer à traction électrique
ExpiredFR322165A
(fr)