The history of the Produx company

The German manufacturer Produx, is known for its sliders, the simpler pocket add / sub tractors named " ADDIATOR ". They can only add or subtract. Numbers are entered with the vertical sliders (one set for positive numbers and one for negative numbers) using the accompanying stylus. The result appears in the circular windows in the middle. They were alternatives for the more expensive and well known pocket caclulator at those time, the Curta.
Produx have made alternatives for desk calculators as well. These are made with much simpler production techniques. The MULTATOR fits in this category. But back to the companies history.

Mr. Otto Meuter was the inventor of the ADDIATOR calculator. Because he had no money, he joined Carl Kuebler, a businessman. C. Kuebler founded the ADDIATOR company in Berlin / Germany in 1920 and O. Meuter got a profit of 50 pence for each calculator produced. 1928 O. Meuter's calculators became successful under the name PRODUX.
After WW-II his company split: In West-Germany PRODUX production continued and under the East-German system RECORD calculators were produced until 1988.
(Has to be continued)