The Comptometer (7 h 50 min, 18 nov 2018 ans – 20 h 53 min, 30 juill. 2019 ans)
Description:
The Comptometer was introduced in 1885, and it was the first mechanical calculator in which numbers were entered/processed by pressing keys. Making the operation of the machine easier.
Instead of having 10 keys for the numbers from 0 to 9, they had columns of 10 keys each, introducing successively . The most powerful calculators had up to 20 columns in their full keyboards.
Ajouté au bande de temps:
Date:
7 h 50 min, 18 nov 2018 ans
20 h 53 min, 30 juill. 2019 ans
~ 8 months