. . . "synchronous electric hour striking unit" . "Electric clock" . "synchronous clocks" . . "electronic clocks" . "Electric clock" . "electromagnetic clock" . "synchronous electric clocks" . . "Electric clock#Synchronous electric clock" . . . "mains-powered mantle clock" . . "electrostatic clock" . "first electric clock" . . "Hipp Toggle" . "electric clock" . . . .