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Comptometer Model WM Attempted Repair
Comptometer 993s - Sumlock Electro Mechanical Adding Machine, Part One - Refurbishment - Retrotech
Comptometer Model E Quick Repair, Overview, and Demo
Evolution of Comptometers 1904-The End (Models A-3D11)
Very Clean Comptometer Model C Lite
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Model A Comptometer Cosmetic Restoration
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Comptometer Demonstration
The Sumlock mechanical calculator, and some advanced calculation techniques.
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Last Updated: October 21, 2026
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Summary
Taking a look at the evolution of the In this video I show how to use a Neill, founder and MD of CIS, has this wonderful piece of old tech in his home office! This is a The Sumlock was made by Bell Punch in the UK from 1940 till the late 60s, but these two were made in the early 1950s. They are ...