Uploaded May 2021 | Updated September 2026, 54 minutes ago

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The Micro-Tally is a cheap adding machine by Technidyne Inc. It is quite rare since it was only in production for a short time in 1970 and 1971, and then electronic calculators became dominant. They are also not very reliable so not many have survived.

For more information about this and other calculators in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction
0:53 Addition
1:12 Clearing input
1:30 Clearing register
2:00 Subtraction
2:33 Patent
3:14 Outro