Carbon microphone, c. 1920s, Ellis Electrical Laboratories - Museum of Science and Industry (Chicago) - DSC06626

Carbon microphone, c. 1920s, Ellis Electrical Laboratories - Museum of Science and Industry (Chicago) - DSC06626

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Author: DaderotSource: commons.wikimedia.org

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metalself-published work1920s productionscc-zerofiles uploaded by daderotcarbon microphoneshistorical microphoneselectrical equipment in the museum of science and industry (chicago)technology in the 1920sring and spring mounts

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