"NPN." YourDictionary, n.d. Web. 23 October 2018. <https://www.yourdictionary.com/npn>.
NPN. (n.d.). Retrieved October 23rd, 2018, from https://www.yourdictionary.com/npn
(1) See new public network.
(2) (Negative Positive Negative) See PN junction.
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