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B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L29/00—Safety means for rail/road crossing traffic
B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
B61L29/28—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated
B61L29/284—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning electrically operated using rail-contacts, rail microphones, or the like, controlled by the vehicle
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FR38457D1929-12-281929-12-28Dispositif pour signaler automatiquement l'arrivée des trains aux passages à niveau
ExpiredFR38457E
(fr)
Dispositif avertisseur pour signaler à distance les changements inadmissibles dans la densité de l'air régnant dans des locaux séparés l'un de l'autre