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- Boilers 5
- Energy industries 3
- Electric power distribution 2
- Electric substations 2
- Men 2
- Northwestern Electric Company 2
- Piping 2
- Building 1
- Construction workers 1
- Cranes, derricks, etc 1
- Electric utilities 1
- Forge shops 1
- Freight cars 1
- Industrial buildings 1
- Labor camps 1
- Oil fields 1
- Oil well drilling rigs 1
- Railroad trains 1
- Snow 1
