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
G04C13/0418—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 by using devices similar to secondary clocks
Selbsttätige Erdschlußanzeigevorrichtung für in Zwei- oder Mehrleitersystemen geschaltete, durch Stromstöße wechselnder Richtung getriebene, polarisierte Uhren.