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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
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
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