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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
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Engineering & Computer Science
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FR342130D1904-03-121904-03-12Dispositif de sureté pour changements de voie
ExpiredFR342130A
(fr)