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Category
Audiology
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Object type
electrical
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hearing (aids)
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hearing aids
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oticon t4
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transistors
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Place
Copenhagen
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Material
case, steel, chrome plate
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frame, plastic
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"Oticon T4" transistor hearing aid, by the American Danish Oticon Corporation, Denmark, 1955-1965
"Oticon T4" transistor hearing aid, by the America
Audiology
1955-1965
