Bar Codes
Bar Codes : The most commonly used form of automatic-identification technology. Basically, a series of light and dark bars of different widths that are used to represent a number, letter or symbol. A bar-code reader, really an optical scanner, emits a beam of light and records the pulsated reflection that occurs when light bounces off the black-and-white bands. The scanner then converts the pulsated reflection of light into electronic data
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