File:DuMont 164 Oscillograph 1939-40.jpg

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English: DuMont was a leading manufacturer of cathode ray tubes and oscilloscopes (oscillographs) from the 1930's until the mid 1950's.
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Own work (Original text: Picture of my collection)

Previously published: My Website: John Eng's Dead Tech Rescue
Author Engradio
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Transferred from en.wikipedia to Commons by Kelly using CommonsHelper.

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  • 2013-02-08 04:21 Engradio 2592×3872× (2599812 bytes) Uploading a self-made file using [[Wikipedia:File_Upload_Wizard|File Upload Wizard]]

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Date/TimeThumbnailDimensionsUserComment
current12:40, 23 December 2022Thumbnail for version as of 12:40, 23 December 20222,100 × 2,900 (2.76 MB)Pittigrilli (talk | contribs)corrected perspective, cropped, colours
07:53, 22 February 2014Thumbnail for version as of 07:53, 22 February 20142,592 × 3,872 (2.48 MB)File Upload Bot (Magnus Manske) (talk | contribs)Transfered from en.wikipedia by User:Kelly using CommonsHelper

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