Thomas Edison's machine shop. From a nice set of 93 photos at the Library of Congress.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...1_fullsize.jpg
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Fullsize image: https://s3-us-west-1.amazonaws.com/h...3_fullsize.jpg
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More: https://www.loc.gov/pictures/search/...&sg%20=%20true
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