Industry type: Unknown, but likely a textile mill
Location: Henry Clay Mill
Active dates: 1869-1870
Summary: The last tenant of Henry Clay Mill, Dean, Knight & Hoppin leased the building from E. I. du Pont de Nemours and Company for just one year and three months. After the company vacated the mill, E. I. du Pont de Nemours and Company began using Henry Clay Mill to manufacture metal powder kegs.
Citations: Boatman, Roy. The Brandywine Cotton Industry, 1795-1865. Hagley Research Report, 1957.