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- Milling machinery 11
- Mills and mill-work 11
- Photography, Industrial 11
- Steel industry and trade 11
- Industrial equipment 9
- Steel --Heat treatment 5
- Iron and steel workers 3
- Open-hearth furnaces 3
- Basic oxygen furnaces 1
- Blast furnaces 1
- Coke-ovens 1
- Metals --Finishing 1
- Rolling (Metal-work) 1
- Steel --Cold working 1
- Steel --Metallurgy --Oxygen processes 1
- Steel ingots 1