The Add-O-Matic Adding Machine (1937-1942) @jaapsch2
The Add-O-Matic Adding Machine (1937-1942) @jaapsch2
Uploaded March 2020 | Updated September 2026, 56 minutes ago
The Add-O-Matic Adding Machine was made from 1937 till about 1942 in Chicago.

For more information on this and other calculators in my collection, visit my site:
jaapsch.net/mechcalc

0:00 Introduction, History
0:25 Addition
1:07 Clearing
1:48 Outro
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Jaap Scherphuis |

The Add-O-Matic Adding Machine (1937-1942)

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