(plural Abt systems)
Named after the inventor, Roman Abt.
"abt-system." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/abt-system>.
abt-system. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/abt-system
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