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- Use of respiratory protective devices under abnormal air pressure
- Some information from an investigation on methods of confining cardox blasting devices in boreholes in certain coal mines
- Prevention of fires caused by electric arcs and sparks from trolley wires
- Ground-resistance measurements of drill-hole casings
- Mine rescue life-line telephone assemblies
- Procedure used in fighting and sealing a fire in an Ohio coal mine and recovery of the mine by air-locking methods