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Person

William Sellers

William Sellers, a Philadelphia engineer and machine-tool manufacturer, is depicted wearing formal attire, including a suit and bow tie, with a serious expression.

Philadelphia engineer and machine-tool manufacturer (1824–1905) who in 1864 proposed an American rival to the Whitworth thread, with a 60-degree angle and flat crests and roots that suited the cutters then in use in United States workshops. The Sellers thread was adopted by the US Navy and the railroads and remained the American standard until the 1948 Unified Thread agreement folded it into a transatlantic compromise.

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