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12 results returnedSearch results
- Use of geophone in locating compressed-air leaks
- Why miners' portable electric lamps require safety devices
- List of permissible mine equipment
- List of permissible mining equipment
- List of permissible mine equipment
- List of permissible mine equipment
- Underground chute gates in metal mines
- List of permissible mine equipment
- List of permissible mine equipment
- List of permissible mine equipment approved during 1937
- Diamond-drilling blast holes, eastern magnetite "Mine B"
- Mobile diesel-powered transportation equipment for gassy noncoal mines and tunnels approved by the Bureau of Mines, 1961-66
