File:Vintage Beltone Tempo Transistor Eyeglass Style Hearing Aid (Hearing Glasses), Sales Model, Made In USA, Circa 1967 (15069206841).jpg - Wikimedia Commons
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File:Vintage Beltone Tempo Transistor Eyeglass Style Hearing Aid (Hearing Glasses), Sales Model, Made In USA, Circa 1967 (14885604170).jpg - Wikimedia Commons