Tesla Company letterhead. Note the words "World Wireless Telephone Transmitter."
Wireless Body Pack Transmitter $240.00
Wireless Powered Dual Speaker Wireless Speakers Type: Not include transmitter $295.32
This publicity photo taken at Colorado Springs was a double exposure. Tesla poses with his "magnifying transmitter" capable of producing
A telephone operator at the Central Office wears a portable headset made by the American Bell Telephone Company, 1923. (Photo by Hulton Arch
Body Pack Transmitter for Anchor Audio Wireless Mic Options $222.30