two-wire pulsing
21ERYX — Infobox Weapon is missile=yes caption= name=ERYX type=Anti tank origin=flagcountry|France flagcountry|Canada era=Cold War, modern launch platform=Individual, Vehicle target= Vehicles, fortifications, helicopters manufacturer=MBDA design date=… …
22Number One Crossbar Switching System — The Number One Crossbar Switching System, or 1XB switch, was the primary urban local telephone exchange design used by the Bell System in the mid 20th century. Its switch fabric topology was based on the earlier urban panel switch system, which,… …
23Characters of Supernatural — Jensen Ackles as Dean Winchester (left) and Jared Padalecki as Sam Winchester (right) Supernatural is an American television drama/thriller series created by writer and producer Eric Kripke, and was initially broadcast by …
24Perfect Dark Zero — North American box art Developer(s) Rare Publisher(s) …
25Dynamic random-access memory — DRAM redirects here. For other uses, see Dram (disambiguation). Computer memory types Volatile RAM DRAM (e.g., DDR SDRAM) SRAM In development T RAM Z RAM TTRAM Historical Delay line memory Selectron tube Williams tube …
26New Amerykah Part One (4th World War) — Studio album by Erykah Badu Released February …
27Mobile phone radiation and health — A man speaking on a mobile telephone The effect of mobile phone radiation on human health is the subject of recent interest and study, as a result of the enormous increase in mobile phone usage throughout the world (as of June 2009 …
28Pittsburgh, Pennsylvania — Infobox Settlement official name = City of Pittsburgh nickname = City of Bridges, Steel City, The Burgh, Iron City, The Smoky City, Steel Town, The College City, Roboburgh motto = Benigno Numine ( With the Benevolent Deity also translated as By… …
29Direct distance dialing — (DDD) or direct dial is a telecommunications term for a network provided service feature in which a call originator may, without operator assistance, call any other user outside the local calling area. DDD requires more digits in the number… …
30Marx generator — diagrams; Although the left capacitor has the greatest charge rate, the generator is typically allowed to charge for a long period of time, and all capacitors eventually reach the same charge voltage …
