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References
- ↑ "Stibitz Model K Adder | 102627225 | Computer History Museum". www.computerhistory.org. Retrieved August 31, 2018.
- ↑ "George Robert Stibitz's Complex Number Calculator". Archived from the original on July 4, 2008. Retrieved September 29, 2017.
- ↑ ""Model K" Adder (replica) - CHM Revolution". www.computerhistory.org. Retrieved August 31, 2018.
- ↑ Irvine, M. M. (July 2001). "Early digital computers at Bell Telephone Laboratories" (pdf). IEEE Annals of the History of Computing. 23 (3): 22–42. doi:10.1109/85.948904. ISSN 1058-6180.
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