A series of medium to large-scale IBM mainframes introduced in 1977, which includes the 3031, 3032 and 3033. See IBM mainframes.
"303x." YourDictionary, n.d. Web. 15 September 2018. <http://www.yourdictionary.com/303x>.
303x. (n.d.). Retrieved September 15th, 2018, from http://www.yourdictionary.com/303x
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