HIGH EFFICIENCY FILAMENT
CD 1964018 E&MP25.076
May 10, 1937
The tweezers in a girl's hand point to a new high-efficiency tungsten filament atop a new type of mount construction for 60-watt Mazda lamps.
The effective length of the improved filament, developed in the Mazda lamp research laboratories, is only half that of the older type filament held horse-shoe fashion by the three supports of the other "mount" shown.