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Topical Subjects
- Coal mines and mining.87
- Coal--Transportation.1
- Coal-handling machinery.1
- Coal-mining machinery.[remove]166
- Conveying machinery.18
- Electricity in mining.1
- Industrial equipment.1
- Loaders (Machines)9
- Machine shops.1
- Mine railroads--Cars.1
- Mine railroads.1
- Mine roof bolting.2
- Mine timbering.1
- Mining machinery.11
- Roof trusses.1
- Shuttle cars (Mine haulage)6