Several industries developed in Bath, including lumber, iron, and brass, with trade in ice and coal. The city and surrounding area is renowned for its shipbuilding and, at one point, was home to more than 200 shipbuilding firms. The industry began in 1743, when Jonathan Philbrook and his sons built two vessels. Since that time, roughly 5,000 vessels have been launched from Bath, which became the nation's fifth largest seaport by the mid-19th century. The clipper ships built in Bath sailed to ports around the world. The last commercial enterprise to build wooden ships in the city was the Percy & Small Shipyard, which was acquired for preservation in 1971 by the Maine Maritime Museum. The most well-known shipyard is the Bath Iron Works, which was founded in 1884 by Thomas W. Hyde. Hyde became the firm's general manager in 1888. It has built hundreds of wooden and steel vessels, mostly warships for the U.S. Navy. During World War II, Bath Iron Works launched one new ship approximately every 17 days. The shipyard today is a major regional employer, and currently operates as a division of the General Dynamics Corporation.