employ+battery
41Battle of Hat Dich — Part of the Vietnam War …
42Radio-frequency identification — (RFID) is a technology that uses radio waves to transfer data from an electronic tag, called RFID tag or label, attached to an object, through a reader for the purpose of identifying and tracking the object. Some RFID tags can be read from… …
43Paintball marker — A paintball marker, also known as a paintball gun, is the central or main piece of equipment in the sport of paintball. Markers make use of an expanding gas such as carbon dioxide, compressed air or nitrogen dioxide to propel paintballs through… …
44motion picture, history of the — Introduction history of the medium from the 19th century to the present. Early years, 1830–1910 Origins The illusion of motion pictures is based on the optical phenomena known as persistence of vision and the phi phenomenon. The first …
45Marching band — For the Swedish band, see Marching Band (band). Goin Band from Raiderland, a college marching band in the United States Video of the Tennessee Volunteers Pride of …
46Hartlepool — Coordinates: 54°41′N 1°13′W / 54.69°N 1.21°W / 54.69; 1.21 …
47Pentagrid converter — For other types of frequency converters please, see Frequency converter. The pentagrid converter is a radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver. Grids of a 12SA7GT… …
48Planned obsolescence — The Centennial Light in the Livermore, California Firehouse is often cited as evidence for the existence of planned obsolescence in later produced light bulbs.[1] Planned obsolescence or built in obsolescence[2] …
49ParkZone — is a brand of intermediate level, radio controlled electric model aircraft produced and distributed by American hobby manufacturer Horizon Hobby of Champaign, Illinois, USA. The name is taken from the term park flyer, denoting a relatively small …
50Invention 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 …
