switch position relay
51North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… …
52Jin Jing — Infobox athlete biography athletename = Jin Jing fullname = dateofbirth = 1981 cityofbirth = Hefei, Anhui countryofbirth = People s Republic of China dateofdeath = cityofdeath = countryofdeath = current position = current team = years with team …
53automobile racing — Sport practiced in a variety of forms on roads, tracks, or closed circuits. It includes Grand Prix racing, speedway racing (including the Indianapolis 500), stock car racing, sports car racing, drag racing, midget car racing, and karting, as well …
54Third rail — For other uses, see Third rail (disambiguation). Third rail at the West Falls Church Metro station near Washington, D.C., electrified at 750 volts. The third rail is at the top of the image, with a white canopy above it. The two lower rails… …
55Signals intelligence operational platforms by nation — This article is a subset article under the main article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with current signals… …
56Centralized traffic control — (CTC) is a signalling system used by railroads. The system consists of a centralized train dispatcher s office that controls railroad switches in the CTC territory and the signals that railroad engineers must obey in order to keep the traffic… …
57Magnetic starter — A magnetic starter is an electromagnetically operated switch which provides a safe method for starting an electric motor with a large load. Magnetic starters also provide overload protection and an automatic cutoff in the event of a power failure …
58Magnetic-core memory — A 32 x 32 core memory plane storing 1024 bits of data. Computer memory types Volatile RAM DRAM (e.g., DDR SDRAM) SRA …
59Keyboard (computing) — In computing, a keyboard is an input device partially modelled after the typewriter keyboard which uses an arrangement of buttons, or keys which act as electronic switches. A keyboard typically has characters engraved or printed on the keys, and… …
60The Mole (U.S. season 2) — The Mole: The Next Betrayal Country of origin  United States No. of episodes 13 …
