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• The value of oxygen breathing apparatus to the mining industry
• Platinum assays and platinum promotions
• Some runaway car trips on inclines at coal mines
• Saving life by barricading in mines and tunnels at times of disaster
• Laboratories that make assays, analyses and tests on ores, minerals, and other substances
• Laboratories that make fire assays, analyses and tests on ores, minerals, and other inorganic substances
• Cutting and polishing stones