Zenith's New Crest Hearing Aid. Basic parts of the tiny, full-powered four-transistor instrument are the extension-type microphone (top left); the amplifier (top right) and the pill size mercury battery. Weighing less than an ounce complete with battery, the Crest is a convertible hearing aid which can be worn ten different ways.

Digital Commonwealth — Boston Public Library

Zenith's New Crest Hearing Aid. Basic parts of the tiny, full-powered four-transistor instrument are the extension-type microphone (top left); the amplifier (top right) and the pill size mercury battery. Weighing less than an ounce complete with battery, the Crest is a convertible hearing aid which can be worn ten different ways.

[ca. June 1956]

RightsCC0 — Public Domain

CollectionDigital Commonwealth — Boston Public Library

[Information from item housing] Hearing Aid

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