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- Industrial equipment 12
- Mills and mill-work 12
- Photography, Industrial 12
- Steel industry and trade 12
- Milling machinery 9
- Iron and steel workers 5
- Steel --Heat treatment 5
- Blast furnaces 2
- Open-hearth furnaces 2
- Basic oxygen furnaces 1
- Chains 1
- Coke-ovens 1
- Metals --Finishing 1
- Photography, Close-up 1
- Rolling (Metal-work) 1
- Steel --Cold working 1
- Steel --Metallurgy --Oxygen processes 1
- Steel ingots 1