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Zenith Royal Hearing Aid
- 3.125 in. H x 2.25 in. W x .75 in. D
Plastic, steel, aluminum, metal
The miniaturized vacuum tubes used in this hearing aid made it portable—but the vacuum tubes sucked energy, requiring large batteries. Users of hearing aids like this one could wear the battery pack in custom-designed leg holsters or, if a woman, tucked into a specially designed brassiere.