 Roe Canada Ltd. purchased a number of companies, including Dominion Steel and Coal Corporation, Canada Car and Foundry (1957), and Canadian Steel Improvement.By 1958, A. V. Roe Canada Ltd. was an industrial giant with over 50,000 employees in a far-flung empire of 44 companies involved in coal mining, steel making, railway rolling stock, aircraft and aero-engine manufacturing, as well as computers and electronics.In 1956 the companies generated 45% of the revenue of the Hawker Siddeley Group.