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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
B61L5/10—Locking mechanisms for points; Means for indicating the setting of points
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FR690928D1930-02-251930-02-25Dispositif de verrouillage temporaire pour aiguilles de chemins de fer
ExpiredFR690928A
(fr)