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Produced by the Wolverine Toy Company of Pittsburgh in the 1950s and marketed as a children's toy, this is a very basic mechanical calculator based on a simple stepped gear mechanism, and is capable only of addition. Nonetheless, it is a good introduction to the design of mechanical calculators, which became very sophisticated before the advent of electronics.
![](https://i.ytimg.com/vi/Lanj0f2-Myg/maxresdefault.jpg)