The firm was thriving in the 1920s and 1930s, with expanding export despite the economic crisis of 1929. Several different relays, such as electro-magnetic and mechanical ones, were produced in series and FRABA pioneered in making relays used in traffic regulations. In 1930 glass-blowing facilities were incorporated into the company. The glass was used as a switching mechanism. Towards the late 1920s other types of relays were developed and FRABA was a forerunner in remote-control systems. It was a sensation when in 1928, FRABA was commissioned by the mayor of Cologne, Konrad Adenauer, to build the remote-control systems for the public street lights in Cologne. The cities Mainz, Munich and Duisburg followed. One person could flip a switch and turn on the lights for the whole city. The importance of the relay switch in those years can be compared to the modern-day microchip.