File:1954 Acousticon Hearing Aid with Hybrid (Tube and Transistor) Circuits.jpg
_Circuits.jpg){kind=small}
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Summary
| Description |
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. |
| Date | |
| Source |
Own work (Original text: My Collection of Hearing Aids) |
| Author | Engradio |
Licensing
Engradio at English Wikipedia, the copyright holder of this work, hereby publishes it under the following licenses:
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Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License. |
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Attribution: Engradio at English Wikipedia
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 15:20, 20 February 2014 | | 3,872 × 2,592 (2.61 MB) | File Upload Bot (Magnus Manske) | Transfered from en.wikipedia by User:Kelly using CommonsHelper |
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_Circuits.jpg){kind=link}