. "1918" . . "4.447E8" . . . . . . "Zenith Corp." . . . . . . "Zenith corporation" . . . . . . . . . "Zenith Radio Corporation" . "Zenith" . . . . . . . "Zenith's" . "Zenith Electronics" . . . . . "Zenith Electronics#Space phone" . "Zenith Electronics Corporation" . "Zenith Electronics" . . "Zenith_Electronics#Remote_controls" . . "976" . . "Zenith Microcircuits" . . . . . . . "Zenith Radio Company" . . . . . . . . . . "Zenith Radio Corp." . . .