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5 янв 1884 г. - Dorr Felt, Comptómetros.
Описание:
El comptómetro fue la primera calculadora mecánica de tecla pulsada, de éxito comercial, patentada en los Estados Unidos en 1887 por Dorr E. Felt.
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By
Lowenski Matos
22 окт 2017
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581
Дата:
5 янв 1884 г.
Сейчас
~ 140 г назад
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