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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.
1878: The first telephone exchange in the United States opens in New Haven, CT under license from Bell Telephone. Within a few years, licensed telephone exchanges open in every major city in the country.878: The first telephone exchange in the United States opens in New Haven, CT under license from Bell Telephone. Within a few years, licensed telephone exchanges open in every major city in the country.