QSL 2001 - Historical Radio Technology



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.

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