- Georg Knorr founds Knorr-Bremse GmbH in Berlin
- Air brakes for freight trains developed
- The company rises to become the largest brake manufacturer for rail vehicles in Europe
- The first air brakes for commercial vehicles are patented.
- The Hildebrand-Knorr braking system becomes the standard in 17 countries.
- 1939: 90% of all German 7-16 t trucks are equipped with Knorr-Bremse systems