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1887
amsterdam
bicycles
calculator
commercially
comptometer
dorr
felt first market markey mechanical patented shirt stall successful syall trams tripComptometer Editorial Photo
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Title
Comptometer #87340395
Description
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
This image is editorial
