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Topical Subjects
- Coal-mining machinery.7
- Conveying machinery.4
- Dams.1
- Electric transformers.2
- Electricity in mining.4
- Elevators.5
- Fire engines.1
- First aid in illness and injury.3
- Freight cars.1
- Loaders (Machines)2
- Mine gases--Measurement.2
- Mine railroads.7
- Mine rescue work.1
- Mine roof bolting.2
- Mine safety.3
- Mine ventilation.1
- Pumping machinery.1
- Safety lamps.1
- Shuttle cars (Mine haulage)2