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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
B61L5/20—Audible signals, e.g. detonator audible signalling
B61L5/206—Signalling means for special purposes
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FR769867D1934-03-091934-03-09Système de protection de secours pour voies ferrées
ExpiredFR769867A
(fr)