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'''Stored program control''' (SPC) was a telecommunications technology used for [[telephone exchanges]] controlled by a computer program stored in the memory of the switching system. SPC was the enabling technology of [[electronic switching system]]s (ESS) developed in the [[Bell System]] in the 1950s and could be considered the third generation of switching technology.
Second generation exchanges such as [[Strowger switch|Strowger]], [[Panel switch|panel]], rotary, and [[Crossbar switch|crossbar]] switches were constructed purely from electromechanical switching components with
|author= Alpha Doggs
|title= Phone switching pioneers to be inducted in National Inventors Hall of Fame
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