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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L25/00—Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
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FR628741D1927-01-281927-01-28Appareil de signalisation pour indiquer la marche des trains ou autres analogues sur une section déterminée
ExpiredFR628741A
(fr)