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John Oldham Steamship patent, 1817

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Patent for the invention of improvements of his former patent (1817 October 18) propelling ships and vessels on seas, rivers and canals. Per wikipedia, "Oldham also paid attention to marine propulsion, and in 1817 he obtained a patent (No. 4169) for propelling ships by means of paddles worked by a steam-engine."

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John Oldham Steamship patent, 1817 2 Linear Feet

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