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Mindenfajta számológép, logarléc és számolási segédeszköz virtuális kiállítóterme
CALCUSEUM KEYSTONE: 240
Virtual Museum of Calculators
Virtual Museum of Calculators
Before there were computers, there were calculators
Virtual Museum of Calculators
HNF - Desk and pocket calculators – Electronic mass products
The Calculators Brief History: When was the calculator invented
HP Virtual Museum: Hewlett-Packard-97 programmable printing calculator, 1976
Virtual Museum of Calculators
The Museum of HP Calculators