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1957 Press Photo Mac Campbell Earphone Circuits

Every photo in our collection is an original vintage print from a newspaper or news service archive, not a digital image. Please see our FAQ for more information.

10 x 8.25 in.

Photo is dated 07/07/1957.

An earphone that resembles a hearing aid lets Mrs. Mac Campbell listen to the clicking sound of voltage regulator circuits as they open and shut.

Photo back:
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