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A digest of patents, issued by the United States, from 1790 to January 1, 1839: published by Act of Congress under the superintendence of the Commissioner of Patents (1840)

United States. Patent Office, Ellsworth, Henry Leavitt, 1791-1858 · Washington, D.C., Printed by Peter Force · leaf 220

An illustration from A digest of patents, issued by the United States, from 1790 to January 1, 1839: published by Act of Congress under the superintendence of the Commissioner of Patents, 1840, leaf 220
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