Aristo
Dennert & Pape
Hamburg, Germany
German Calculator brand made by Dennert & Pape that were very big in the mechanical slide rule market.
About 100 years later they introduced under the trademark ARISTO with the model M27 their first electronic pocket calculator and the first german calculator. There range of electronic pocket calculators are lovely modern-looking designs. Because the Far East competition, the company must stop the the production in 1978.