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File:Cunningham Tubes in the early 1920's (RCA licensed tubes).jpg

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English: After the 1920 RCA lawsuit, Cunningham tubes mirrored RCA brand tubes. All of these tubes were designed by General Electric.
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Source Own work
Author Engradio

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Date/Time Dimensions User Comment
04:04, 12 February 2013 3,872 × 2,592 (2,474,089 bytes) w:en:Engradio (talk | contribs) (Uploading a self-made file using [[Wikipedia:File_Upload_Wizard|File Upload Wizard]])

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current21:50, 12 February 2013Thumbnail for version as of 21:50, 12 February 20133,872 × 2,592 (2.36 MB)ALHTransferred from en.wikipedia: see original upload log above

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