In 1887, a mechanic named Dorr E.
Felt patented his Comptometer - a key-operated adding machine that is still the fastest in the world.
www.hnf.deDer Mechaniker Dorr E.
Felt entwickelte das 1887 patentierte "Comptometer", eine tastengetriebene Addiermaschine, die noch heute die schnellste Addiermaschine der Welt ist.
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