File:1954 Acousticon Hearing Aid with Hybrid (Tube and Transistor) Circuits.jpg

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English: Raytheon was the leading manufacturer of Subminiature Tubes and Transistors for hearing aid applications from the 1940's until the end of the 1950's.
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Own work (Original text: My Collection of Hearing Aids)

Previously published: My Website: John Eng's Dead Tech Rescue
Author Engradio

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Engradio at English Wikipedia, the copyright holder of this work, hereby publishes it under the following licenses:
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Transferred from en.wikipedia to Commons by Kelly using CommonsHelper.

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  • 2013-02-05 03:36 Engradio 3872×2592× (2733191 bytes) Uploading a self-made file using [[Wikipedia:File_Upload_Wizard|File Upload Wizard]]

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current15:20, 20 February 2014Thumbnail for version as of 15:20, 20 February 20143,872 × 2,592 (2.61 MB)File Upload Bot (Magnus Manske) (talk | contribs)Transfered from en.wikipedia by User:Kelly using CommonsHelper

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