Dominion Steel and Coal Corporation
The Dominion Steel and Coal Corporation, Limited, known commonly as Dosco, was a Canadian coal mining and steel manufacturing company. Incorporated in 1928 and operational by 1930, DOSCO was predated by the British Empire Steel Corporation (BESCO), which was a merger of the Dominion Coal Company, the Dominion Iron and Steel Company and the Nova Scotia Steel Company.
Source: Wikipedia — Dominion Steel and Coal Corporation (CC BY-SA 4.0)