United States Patents, 1790 to 1870: New Uses for Old Ideas
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Welsh, Peter C. 1965. "<a href="https://repository.si.edu/handle/10088/21744">United States Patents, 1790 to 1870: New Uses for Old Ideas</a>." <em>Bulletin of the United States National Museum</em>, (241) 109–152, 57 figures.
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Except where otherwised noted, this item's license is described as No Copyright - United States