John H.Hall (1781-1841) ·John H.Hall was an inventor and entrepreneur. He was the director of the Rifle Works at the Harpers Ferry Armory.Hall developed and improved his system of manufacture, and his system was soon deployed in the manufacture of newly invented mass consumption items,such as sewing machines,typewriters,and bicycles.(right:The Harpers Ferry Armory) John H. Hall (1781–1841) • John H. Hall was an inventor and entrepreneur. He was the director of the Rifle Works at the Harpers Ferry Armory. Hall developed and improved his system of manufacture, and his system was soon deployed in the manufacture of newly invented mass consumption items, such as sewing machines, typewriters, and bicycles. (right: The Harpers Ferry Armory)