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The HP 9845 Project
ids.si.edu/ids/deliveryService?id=NMAH-DOR2014-030
k09-the_magic_numbers_of_dr._matrix_0
walden
History of the Internet - Techopedia
John Wolff's Web Museum - Early Electronic Calculators
How do calculators work? - Explain that Stuff
National Museum of American History
Vintage Texas Instruments TI-2510 Calculator 1973
How do calculators work? - Explain that Stuff
The Pocket Calculator Race
Machine Computation and Digitization
Machine Computation and Digitization
Amazing at the Time: Dad's First Calculator in 1973 - Connecting the Dots