Spark Transmitter
(1916)
Prague
Electromagnetic Speaker in wooden cabinet
(1925)
Four-Valve Battery-Operated Receiver
(1924-26)
Czechoslovakia
Etavox Electromagnetic Speaker
(1927)
Griffith Radio Receiver
(1930)
USA
Technowatt Carbon Microphone
(1930-1940)
Tesla 4002 A TV and Radio Combo
(1954-57)
Czechoslovakia
Tesla "Korespondent" Dictaphone
(1960)
Czechoslovakia
These QSL cards show items from the collections of the National Technical Museum, Prague.
QSL cards