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Baldwin Calculating Engine

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This is the US Patent Office model for a printing pinwheel calculating machine patented by Frank S Baldwin of St Louis, Mo., in 1875. The machine has a brass base, two open brass pieces on each side that form a frame, and a brass, steel, and wooden mechanism. A cylindrical drum mounted horizontally on the frame is 11.5 cm. (4–1/2”) in diameter and 5 cm. (2”) in height. Date: 1870s. Record ID: nmah_694172.

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