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William S. Harley, age 21, completes a blueprint drawing of an engine designed to fit into a bicycle.
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The "F-head" engine becomes a workhorse of the Harley-Davidson motorcycle until 1929.
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By 1920, Harley-Davidson is the largest motorcycle manufacturer in the world. New Harley-Davidson® motorcycles can be purchased from over 2,000 dealers in 67 countries worldwide.
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