comptometer
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners.
comptometer |
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| navigate by keyword : 1887 amsterdam bicycles calculator commercially comptometer dorr felt first market markey mechanical patented shirt stall successful syall trams trip |
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| The comptometer was the first commercially successful key-driven mechanical calculator, patented in the USA by Dorr E. Felt in 1887. This one was on a market stall in a market in Amsterdam |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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