Schickard calculator (Calcolatrice di Schickard)
thingiverse
Reduced 4-digit version of Schickard's calculator from 1623. He requires memory and facilitator for multiplication: thing to download separately. A simplified 4-digit model of the 1623 Schickard calculator is available. It needs a memory module and multiplier for accurate calculations, which can be downloaded as an additional feature.
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