DOSCO Subsidiaries
- Refer to: Industrial Heritage of Cape Breton Island.
- Acadia Coal Company Limited, Stellarton, NS
- Aluminum Industries Limited, Montreal, QC
- Canadian Bridge Company Limited, Walkerville, ON
- Canadian Bridge Engineering Company Limited, Walkerville, ON
- Canadian Steel Corporation Limited, Ojibway, ON
- Canadian Steel Lands Limited, Ojibway, ON
- Canadian Transmission Tower Company Limited, Montreal, QC
- Canadian Tube and Steel Products Limited, Montreal, QC
- Cibou Steamship Company Limited, London, UK
- Dominion Coal Company, Glace Bay, NS
- Dominion Coal Import Company Limited, Montreal, QC
- Dominion Rolling Stock Company Limited, Sydney, NS
- Cumberland Railway and Coal Company, Springhill, NS
- Sydney and Louisburg Railway Company, Glace Bay, NS
- Dominion Iron and Steel Company, Sydney, NS
- Dominion Limestone Limited, Aguathuna
- Dominion Shipping Company Limited, Sydney, NS
- Dominion Wabana Ore Limited, Bell Island, NL
- DOSCO Overseas Engineering Limited, Beaconsfield, UK
- Empire Housing Company Limited, Sydney, NS
- Essex Terminal Railway Company, Walkerville, ON
- Eastern Car Company Limited, Trenton, NS
- Graham Nail & Wire Products Limited, Toronto, ON
- Halifax Shipyards Limited, Halifax, NS
- Nova Scotia Steel and Coal Company Limited, Trenton, NS
- Old Sydney Collieries Limited, Sydney Mines, NS
- James Pender & Company, Saint John, NB
- Scotia Rolling Stock Company Limited, Trenton, NS
- Seaboard Power Corporation Limited, Glace Bay, NS
- Stothert & Pitt (Canada) Limited, Montreal, QC
- Stowell Screw Company Limited, Longueuil, QC
- Trenton Industries Limited, Trenton, NS
- Trenton Steel Works Limited, Trenton, NS
- Truscon Steel Company of Canada Limited, Walkerville, ON
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