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Bureau of Standards, steel testing machine. 2,300,000 [...] capacity

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Public domain historical photo, free to use, no copyright restrictions image - Picryl description

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glass negatives bureau standards steel machine capacity industrial history library of congress
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Date

01/01/1910
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Source

Library of Congress
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Link

http://www.loc.gov/
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glass negatives bureau standards steel machine capacity industrial history library of congress