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Some progress with the old calculator

There are a number of YouTube videos about the restoration of machines like this (a Monroe 8N-213) and comparable machines (such as the Friden STW10). The challenge to getting them fully operational is getting them to multiply and divide, operations that are much more mechanically complicated than addition and subtraction. So far, though, I have not discovered anything that is actually broken. All the problems have been caused by gears, levers, cams, and shafts that stuck as the old lubricants dried out, plus 50 years of not being used.

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