(YouTube Link)
Retro Calculators is a web museum of mechanical calculating devices, such as slide rules and adding machines. Its YouTube channel includes videos of these machines in use, including the above Faber Castell Addiator. This is a gadget that combines a slide rule with an adding and subtracting device.
Link via View from the Porch | YouTube Channel
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Very neat!
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I am so glad I was born in a time of cheap electronic pocket calculators.
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