In 1925, Flechsig completed his doctorate with the dissertation "Science of Photoelectric Primary Current in Crystals."
In 1937, the Internationale Funkausstellung of the Reichspost Research Institute displayed a color television method.
The patent title was "Cathode Ray Tube for the Development of Multicolored Pictures on a Fluorescent Screen.
"[3] An exhibit at the 1939 Internationale Funkausstellung Berlin displayed a prototype of Flechsig's color television receiver.
[4] The war put an end to technical implementation of Flechsig's shadow mask picture tube.