manually-operated telephone system
11Royal Observer Corps — Ensign Active 1925–1996 Country …
12Modem — For other uses, see Modem (disambiguation). A modem (modulator demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. The… …
13Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
14Bay Area Rapid Transit — Infobox Public transit name = Bay Area Rapid Transit imagesize = 100px locale = San Francisco Bay Area transit type = Rapid transit began operation = September 11, 1972 system length = convert|104|mi|km|abbr=on lines = 5 stations = 43 (1 under… …
15canals and inland waterways — ▪ waterway Introduction natural or artificial waterways used for navigation, crop irrigation, water supply, or drainage. Despite modern technological advances in air and ground transportation, inland waterways continue to fill a vital …
16automation — /aw teuh may sheuhn/, n. 1. the technique, method, or system of operating or controlling a process by highly automatic means, as by electronic devices, reducing human intervention to a minimum. 2. a mechanical device, operated electronically,… …
17Cellular network — Top of a cellular radio tower A cellular network is a radio network distributed over land areas called cells, each served by at least one fixed location transceiver known as a cell site or base station. When joined together these cells provide… …
18Level crossing — This article is about at grade intersections between railway and road. For where two rail lines cross, see level junction. For a type of nuclear receptor (RXR), see Retinoid X receptor. A level crossing at Chertsey, England, as the barriers rise …
19California Department of Forestry and Fire Protection — InfoboxFireDepartment name = California Department of Forestry and Fire Protection (CALFIRE) motto = established = 1905 staffing = Career strength = 3,800 permanent 1,400 seasonal 4,300 inmates 8,200 volunteers [http://www.fire.ca.gov/about/about …
20Signals intelligence in modern history — This article is a subset article of the article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with signals intelligence in the… …
