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In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
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In Uncle Sam's Service: WWI Inventor William J. Hammer | Lemelson Center for the Study of Invention and Innovation
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James Nasmyth's patent steam hammer, 1843, James Hall Nasmyth, a Scottish engineer and inventor Stock Photo - Alamy
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