Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
G04C13/00—Driving mechanisms for clocks by primary clocks
G04C13/02—Circuit arrangements; Electric clock installations
G04C13/04—Primary clocks
G04C13/0409—Primary clocks monitoring or controlling primary clock or system with more than one primary clock, e.g. for switching-over to standby motor or power system
G04C13/0427—Systems in which secondary clocks function as primary clocks for other secondary clocks
Schaltung zur elektrischen Fernsteuerung von Schreibmaschinen durch lange und kurze Stromstoesse gleichen Vorzeichens, die durch Pausen verschiedener Dauer getrennt sind