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Vintage Soviet-Made Crystal (Body) Transistor Hearing Aid With Storage Case, Type 67-4, Produced By The Moscow Factory Of Hearing Aids, Hearing Aid Measures 2.75 Inches High, Circa Late 1960s - 1970s
https://flic.kr/p/FZNmQA | Vintage Sonotone Model 1010 Hybrid (2 Vacuum Tubes & 1 Transistor) Hearing Aid. The First Commercial Product In The World To Use Transistors, Made In USA, Introduced December 29, 1952 | The Sonotone 1010 hearing aid was the first commercial product in the world to use transistors which had been invented five years earlier in 1947.
Vintage Fidelity Transistor (Body) Hearing Aid, Model F-364, Made By Viennatone In Austria, Distributed By Fidelity Electronics Ltd. Of Miami, Florida, Circa 1967
Vintage Soviet-Made Crystal (Body) Transistor Hearing Aid With Storage Case, Type 67-4, Produced By The Moscow Factory Of Hearing Aids, Hearing Aid Measures 2.75 Inches High, Circa Late 1960s - 1970s
