File:Incandescent Electric Lighting - Fig 20.png

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Fig. 20.

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Description
English: Fig. 20.
Date
Source https://en.wikisource.org/wiki/Page:Incandescent_electric_lighting-_A_practical_description_of_the_Edison_system.djvu/76
Author Louis H. Latimer

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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:Incandescent_Electric_Lighting_-_Fig_20.png

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