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Benjamin Bradley inventorBorn: 1830? A slave, Bradley was employed at a printing office and later at the Annapolis Naval Academy, where he helped set up scientific experiments. In the 1840s he developed a steam engine for a war ship. Unable to patent his work, he sold it and with the proceeds purchased his freedom. Died: ?Information Please® Database, © 2007 Pearson Education, Inc. All rights reserved. More on Benjamin Bradley from Infoplease:
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