File:Fundamentals of the vacuum tube.gif

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Fundamentals_of_the_vacuum_tube.gif (448 × 600 pixels, file size: 213 KB, MIME type: image/gif)

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Description
English: RADIO INSTRUCTION COURSE.
Date WW II
Source
This media is available in the holdings of the National Archives and Records Administration, cataloged under the National Archives Identifier (NAID) 515270.

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Author Sylvania
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current17:12, 18 August 2008Thumbnail for version as of 17:12, 18 August 2008448 × 600 (213 KB)Pieter Kuiper (talk | contribs){{Information |Description={{en|1=RADIO INSTRUCTION COURSE.}} |Source={{NARA-image|id=515270}} |Author=Sylvania |Date=WW II |Permission={{PD-because|NARA says: "Use Restriction(s): Unrestricted"}} |other_versions= }} <!--{{ImageUpload|full}}--> [[Categor

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