level crossing with automatic light signal
121Naval mine — Polish wz. 08/39 contact mine. The protuberances around the top of the mine, called Hertz horns, are part of the detonation mechanism …
122Traffic congestion — Traffic jam redirects here. For other uses, see Traffic jam (disambiguation). Traffic congestion on Marginal Pinheiros, near downtown São Paulo. According to Time magazine, São Paulo has the world s worst traffic jams.[1 …
123de Havilland Comet — This article is about the jet airliner. For the 1930s racing aircraft, see de Havilland DH.88. DH 106 Comet …
