switch control relay
121Track circuit — A track circuit is a simple electrical device used to detect the presence or absence of a train on rail tracks, used to inform signallers and control relevant signals. Principles and operation The basic principle behind the track circuit lies in… …
122automobile 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 …
123Liste von Abkürzungen (Computer) — Dies ist eine Liste technischer Abkürzungen, die im IT Bereich verwendet werden. Inhaltsverzeichnis A B C D E F G H I J K L M N O P Q R S T U V W X Y Z siehe auch: Liste von Dateiendu …
124Recreational vehicle — This article is about the vehicle. For the film, see RV (film). RV redirects here. For other uses, see RV (disambiguation). A Class A motorhome with slide out extended floors …
125Two-way radio — receiver which only receives content. Two way radios are available in mobile, stationary base and hand held portable configurations. Hand held radios are often called walkie talkies or handie talkies. A push to talk or Press To Transmit button is …
126StrataCom — StrataCom, Inc. was founded in Cupertino, California, USA, in January 1986 by 26 former employees of the failing Packet Technologies, Inc. StrataCom produced the first commercial cell switch, also known as a fast packet switch. Its product was… …
127ER2 electric trainset — ER2 ELECTRIC TRAINSETSince 1962 Railroad Machinery Plants of Riga and Kalinin started to release ER2 electric trainsets instead of ER1. ER2 cars have footboards for low platforms, and aprons for high platforms (installed in train yards.) The… …
128Keyboard (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… …
