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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 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