File:Beam control knobs of 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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Engradio at English Wikipedia, the copyright holder of this work, hereby publishes it under the following licenses:
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current20:51, 2 January 2023Thumbnail for version as of 20:51, 2 January 20231,520 × 1,086 (729 KB)Pittigrilli (talk | contribs)File:DuMont 164 Oscillograph 1939-40 (edited).jpg cropped 20 % horizontally, 63 % vertically using CropTool with precise mode.

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