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Curta Mechanical Calculator, a small, hand-cranked mechanical calculator introduced by Curt Herzstark in 1948. It can be used to perform addition, subtraction, multiplication, division, and (with more difficulty) square roots and other operations. considered the best portable calculators available until they were displaced by electronic calculators in the 1970s.

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Vintage Mechanical Calculator Mid Century by ClassicStash on Etsy

The Antikythera mechanism is an ancient mechanical computer designed to calculate astronomical positions. It was recovered in 1900–1901 from the Antikythera wreck. However, its significance and complexity were not understood until decades later. The construction has been dated to the early 1st century BCE. Technological artifacts of similar complexity and workmanship did not reappear until the 14th century, when mechanical astronomical clocks were built in Europe. modern reconstruction at…

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Making a Mechanical Calculator Divide By Zero Is Just Mean http://www.iconicvideos.biz/making-mechanical-calculator-divide-zero-just-mean/

from Etsy

Mechanical Calculator Patent - Decor, Accountant Office Decor, CPA Gift,Accountant Gift, Patent Print, Calculator Patent

Hey, I found this really awesome Etsy listing at https://www.etsy.com/listing/269325127/mechanical-calculator-patent-decor