Uploaded June 2019 | Updated September 2026, 41 minutes ago

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The Brunsviga 90 TA is an adding machine. It has a full keyboard, and uses a toothed rack mechanism. Between 1953 and 1955 these were sold as the Komet TA 8/9. After Komet went bankrupt Brunsviga bought the rights, and sold these machines from 1956 to about 1959.

For more information about this machine and other mechanical calculators in my collection, see my website:
jaapsch.net/mechcalc

0:00 Introduction
0:13 Addition
0:56 Subtraction
1:32 Negative results
2:59 Clearing register
3:14 Repeat
3:46 Clearing input
4:12 Serial number
4:30 Mechanism
6:23 History
7:15 Outro