A series of medium-scale IBM mainframes initially introduced in 1979, which include the 4300, 4321, 4331, 4341, 4361 and 4381.
"43xx." YourDictionary, n.d. Web. 21 June 2018. <http://www.yourdictionary.com/43xx>.
43xx. (n.d.). Retrieved June 21st, 2018, from http://www.yourdictionary.com/43xx
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