File:William D. Coolidge in PM 1927.jpg

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English: Coolidge in Popular Mechanics, holding a cathode ray tube.
Date Jan 1927
Source Popular Mechanics, Jan 1927, https://archive.org/details/PopularMechanics1927/Popular_Mechanics_01_1927/page/n97/mode/2up?view=theater
Author Unknown

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Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:William_D._Coolidge_in_PM_1927.jpg

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current22:45, 25 November 2023Thumbnail for version as of 22:45, 25 November 2023908 × 792 (246 KB)Oaktree b (talk | contribs)Uploaded a work by Unknown from Popular Mechanics, Jan 1927, https://archive.org/details/PopularMechanics1927/Popular_Mechanics_01_1927/page/n97/mode/2up?view=theater with UploadWizard

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