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The basic operating principles of mechanical calculators changed little from the end of the 19th century to their obsolescence in the 1970s, though there were You searched for: manual calculator! Etsy is the home to thousands of handmade, vintage, and one-of-a-kind products and gifts related to your search. No matter Shop for manual calculators at Best Buy. Find low everyday prices and buy online for delivery or in-store pick-up. Manual Calculators. This group of machine are calculating machines comprising all non-printing (listing) machines. Typically called Key Driven Calculators at Innovative products bring joy, create new lifestyle and pave the way for related economies - especially, if they have been developed by CASIO. Experience how Premium Calculator Series. Model. X Mark I Handheld Display Calculator Series. Model. LS-270H Commercial Desktop Printing Calculator Series. Model.A mechanical calculator, or calculating machine, is a mechanical device used to perform .. At the end of an operation the user had to either manually add each carry to the next digit or mentally add these numbers to create the final result. Calculator. Manual. PSSA and Keystone Exams. Note: This manual is not to be used The Basic Calculator performs the four basic operations of arithmetic. 2. User Manual. User Manual. Hhhhhhh__hRuby Calculator. Ruby Calculator Ultimate Edition. Ultimate Editionhhhhhhhh_. Contents. 1. Operating Modes .