The Addo Primary Calculator
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YouTubeJaap Scherphuis
The Addo Primary Calculator
The Addo Primary Calculator is a simple toy adder. It was made in 1964 by the British branch of the Swedish Addo company which manufactured office adding machines. The mechanism is very similar to Hart's Mercantile Computing Machine. See @stephenfreeborn Stephen Freeborn's video: https://www.youtube.com/watch?v=-3JQoArQo3A For more information ...
1.7K views1 month ago
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3.1K views · 59 reactions | Luxury mechanical calculator from 1960 | engineering.com | Facebook
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