rotary switching system
81Voicemail — (also known as voice mail, voice message, or voice bank) is a computer based system that allows users and subscribers to exchange personal voice messages; to select and deliver voice information; and to process transactions relating to… …
82Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism …
83Electric vehicle — Sustainable energy Renewable energy …
84ST Kinetics — Type Subsidiary of ST Engineering which is publicly listed on SGX Industry Defence Commercial Vehicles Automotive Services Founded 1967 as the Chartered Industries o …
85Radio communications during the September 11 attacks — This article reviews some of the details of radio communications at the September 11, 2001 World Trade Center attacks. [The purpose of revealing the operational details in this article is to allow operators of other communications networks and… …
86Mouse (computing) — A computer mouse with the most common standard features: two buttons and a scroll wheel, which can also act as a third button In computing, a mouse is a pointing device that functions by detecting two dimensional motion relative to its supporting …
87Transmission electron microscopy — A TEM image of the polio virus. The polio virus is 30 nm in size.[1] Transmission electron microscopy (TEM) is a microscopy technique whereby a beam of electrons is transmitted through an ultra thin specimen, interacting with the specimen as it… …
88Canadian National Railway — Canadian National system map …
89Postage stamps and postal history of the United States — This is a survey of the postage stamps and postal history of the United States of America (USA).Early postal historyIn the American colonies, informal independently run postal routes began in Boston as early as 1639, with Boston to New York City… …
90Vertical service code — A vertical service code or VSC is a special code dialed prior to (or instead of) a telephone number that engages some type of special telephone service. Typically preceded with an asterisk, or * (star), key on the touch tone keypad and… …
