Amazing at the Time: Dad's First Calculator in 1973 - Connecting the Dots

Machine Computation and Digitization

File:Vintage Texas Instruments Datamath Pocket LED Calculator, Model TI-2500, Version 3, Made in the USA, Circa 1973 (41029101670).jpg - Wikimedia Commons

The Pocket Calculator Race

ids.si.edu/ids/deliveryService?id=NMAH-DOR2014-030

National Museum of American History

The Singularity Is Near by Ray Kurzweil by Brook Kiper - Issuu

HNF - Desk and pocket calculators – Electronic mass products

Machine Computation and Digitization

How do calculators work? - Explain that Stuff