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- Energy industries 62
- Northwestern Electric Company 50
- Electric substations 29
- Electric power distribution 27
- Electric utilities 20
- Electric apparatus and appliances 19
- Piping 17
- Electric lines 15
- Electric switchgear 11
- Streets 11
- Electric machinery 8
- Building 7
- Rivers 6
- Dams 5
- Boilers 3
- Dams--Design and construction 3
- Industrial buildings 3
- Pipelines 3
- Buildings 2
- Dams--Washington (State) 2
