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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
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Field Test: Are These Spy Camera Sunglasses with a Built-In MP3 Player Worthy of James Bond or Mr. Bean?
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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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