Before the invention of electronic calculators, it was used to perform complex calculations in mathematics, science, and engineering. History of creation: It was manufactured by the German company 'Aristo' (Dennert & Pappe) between 1949 and 1977.
Fields of application: Extremely complex scientific calculations such as multiplication, division, square root, trigonometry, and logarithms could be performed in the blink of an eye. At that time, it was a very popular device among engineers and scientists.
Brand: Aristo (A popular brand name of the famous German company Dennert & Pappe).
Type: Duplex Slide Rule or Analog Mathematical Calculator.