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TI-59 / TI-58 - Wikipedia
TI 58 Calculator Fun! - YouTube
TI58 Special Function Calculators
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TI-58C Scientific Calculator from 1978 - YouTube
Vintage Texas Instruments TI Programmable 58 Electronic Handheld Calculator, Model TI-58, Made In USA, Introduced In 1977 | Old computers, Calculator, Pocket calculators
Texas Instruments TI-58 Programmable Calculator for sale online | eBay
Lin.ear th.inking: The TI-58/59 programmable calculators