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The Comptometer (7 St. 50 Min, 18 Nov 2018 Jahr – 20 St. 53 Min, 30 Jul 2019 Jahr)

Beschreibung:

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.

Zugefügt zum Band der Zeit:

Datum:

7 St. 50 Min, 18 Nov 2018 Jahr
20 St. 53 Min, 30 Jul 2019 Jahr
~ 8 months