manual telephone set
51Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
52Mark B. Cohen — For other uses, see Mark Cohen (disambiguation). Mark B. Cohen Member of the Pennsylvania House of Representatives from the 202nd district Incumbent Assumed office 1974 Preceded by Eugene Gelfand …
53computer science — computer scientist. the science that deals with the theory and methods of processing information in digital computers, the design of computer hardware and software, and the applications of computers. [1970 75] * * * Study of computers, their… …
54education — /ej oo kay sheuhn/, n. 1. the act or process of imparting or acquiring general knowledge, developing the powers of reasoning and judgment, and generally of preparing oneself or others intellectually for mature life. 2. the act or process of… …
55Private branch exchange — A private branch exchange (PBX) is a telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public. PBXs are also referred to as …
56Costa Rica — Costa Rican. /kos teuh ree keuh, kaw steuh, koh /; Sp. /kaws tah rddee kah/ a republic in Central America, between Panama and Nicaragua. 3,534,174; 19,238 sq. mi. (49,825 sq. km). Cap.: San José. * * * Costa Rica Introduction Costa Rica… …
57Media and Publishing — ▪ 2007 Introduction The Frankfurt Book Fair enjoyed a record number of exhibitors, and the distribution of free newspapers surged. TV broadcasters experimented with ways of engaging their audience via the Internet; mobile TV grew; magazine… …
58'Allo 'Allo! (series 7) — This article contains episode summaries for the seventh series of the British Sitcom series Allo Allo!. The series contains ten episodes which first aired between 5 January and 16 March 1991. There is a gap of fifteen months between the… …
59History of computing hardware — Computing hardware is a platform for information processing (block diagram) The history of computing hardware is the record of the ongoing effort to make computer hardware faster, cheaper, and capable of storing more data. Computing hardware… …
60Economic Affairs — ▪ 2006 Introduction In 2005 rising U.S. deficits, tight monetary policies, and higher oil prices triggered by hurricane damage in the Gulf of Mexico were moderating influences on the world economy and on U.S. stock markets, but some other… …
