31324537signaling equipmentPT2026-03-30 20:27:31UF31324538equipment, signalingNDBT31307333equipment by processPTNT31353487traffic signalsPTNT31325027sound signaling devicesPTNT31353471flaresPTNT31353474flare pistolsPTNT31353483railroad signalsPTNT31353485semaphoresPTNT31386170Aldis lampsPTNT31386175aerial marker panelsPTNT31386178alarm lampsPTNT31386233semaphore flagsPTNT31386235semaphore lampsPTRT31297860signalsPT