MAGNAVOX
ELECTRICAL SOUND-AMPLIFYING DEVICES, [LOUD-SPEAKING TELEPHONES, MARINE TELEPHONES,] AIRCRAFT-TELEPHONES, [DESK-TELE PHONES,] AUDION-FREQUENCY-AMPLIFYING CABINETS, [CONTROL-BOXES FOR LOUD-SPEAKING TELEPHONES, LOUD SPEAKING TRANSMITTERS, JUNCTION-BOXES,] ANTINOISE-TELEPHONES [, AND MASTER-RINGERS FOR MARINE TELEPHONE EQUIPMENT]
Cancelled · June 29, 1920 · 71134375 ·