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DEFINITION of 'Opening Bell'. A bell that is rung to signify the start of the day's trading session. The opening bell is both a symbol of the opening of the market for the day and a physical event involving an individual striking a metal bell. Since 1985, the New York Stock Exchange (NYSE) has used the opening bell to start its trading session at 9:30 a.m.
1 28 January 1878: The first commercial North American telephone exchange is opened in New Haven, Connecticut. 2  4 February 1878: Edison demonstrates the telephone between Menlo Park, New Jersey and Philadelphia, a distance of 210 kilometres (130 mi). 14 June 1878: The Telephone Company (Bell's Patents) Ltd. is registered in London. 2  Opened in London on 21 August 1879, it is Europe's first telephone exchange, followed a couple of weeks later by one in Manchester. 3  12 September 1878: the Bell Telephone Company sues Western Union for infringing Bell's patents.