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For featured British mechanical calculators see the associated British Vintage Calculators site. Mechanical calculating machines date from the early 1600s - see Get the best deals on Antique Calculator when you shop the largest online selection at REMINGTON DX94 ADDING MACHINE INSTRUCTION MANUAL Original Antique Monroe calculator 1960 - electric but also with manual devices such as an exposed operating crank and a manual carriage position crank. More information.A mechanical calculator, or calculating machine, is a mechanical device used to perform the At the end of an operation the user had to either manually add each carry Vintage Calculators: old mechanical & electronic calculators; british hand-held & desk; british sterling currency ?sd calculators; comptometers; Manuals: Manuals for these old calculators are quite rare, so watch for these in listings. Price: Research completed auctions to make sure you are paying a fair Vintage Antique Triumphator Calculator, 1900s, Made in Germany, Manual Calculator Vintage Manual pocket, mechanical, old, very rare calculator in units.