The Telechron company 's success from the 1920s into the 1950s was not solely due to the technical advantages of their clocks .
All Telechron clocks were powered by successive versions of Henry Warren 's synchronous motor .
The Telechron company 's success from the 1920s into the 1950s was not solely due to the technical advantages of their clocks , although all Telechron clocks were powered by successive versions of Henry Warren 's synchronous motor .