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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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File:William Hammer - Still-life of figs in a basket and fruit on a ledge (1855).jpg - Wikimedia Commons
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William Hammer - 19th Century Paintings and Watercolours 2017/12/05 - Realized price: EUR 6,827 - Dorotheum
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