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My mother has used such manually operating machine in the late 60s. It was called the slide ruler or something.
by ReptileMan 9mo ago
My mother has used such manually operating machine in the late 60s. It was called the slide ruler or something.
- defrost 9mo agoMine also. Truly what goes around, comes around: https://www.instructables.com/Circular-Slide-Rule/ https://www.instructables.com/Circular-Slide-Rule/