The Great Lakes Engineering Works (GLEW) was a leading shipbuilding company with a shipyard in Ecorse, Michigan, that operated between 1902 and 1960. Within three years of its formation, it was building fifty percent of the tonnage of all ships in the Great Lakes. During World War II, GLEW was commissioned by Pittsburgh Steamship Company and the U.S. Maritime Commission to build twenty-one ore freighters. Its innovations included the first self-unloader freighter, SS Wyandotte. GLEW is best known for its construction of the SS Edmund Fitzgerald.