File:PSM V88 D100 Oscillating electronic vacuum tube.png
Changed cat from "Vacuum tubes" to more specific "Audion"
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Revision as of 05:35, 24 March 2013
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[[Category:Popular Science Monthly illustrations/Volume 88]]
[[Category:Popular Science Monthly illustrations/Volume 88]]
[[Category:Uploaded with UploadWizard]]
[[Category:Uploaded with UploadWizard]]
−
[[Category:Vacuum tubes]]
+
[[Category:Audion]]
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/image%2F0119748%2F20140527%2Fob_49a920_alfred-molet-timbre-postal-01.JPG)
/image%2F0119748%2F20140511%2Fob_63b87d_carte-02.jpg)
