In 1765 Peter's sons Curtis and Peter Jr. took over the operation, and in 1798 it passed to Robert Coleman and his family.
Peter Grubb, Jr. (1740–1786), American patriot and member of Grubb Family Iron Dynasty
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He was the fourth- and last-generation scion of a family which controlled Cornwall Iron Furnace, in Cornwall, Pennsylvania, a major coal-burning ironmaking facility that was founded in 1742 by Peter Grubb and which produced pig iron, domestic products and, during the American Revolution and Civil War, cannon barrels.