| L. Bonnefoux - 1864 - Страниц: 778
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidenta, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| United States - 1917 - Страниц: 706
...mining, especially in relation to the safety of miners, the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the use of explosives and electricity, the prevention of accidents, and other inquiries and technologic... | |
| United States. Department of the Treasury - 1911 - Страниц: 498
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| 1918 - Страниц: 892
...especially In relation to the safety of miners and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| 1911 - Страниц: 640
...mining, especially in relation to the safety of miners, the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the use of explosives and electricity, the prevention of accidents, and other inquiries and technologic... | |
| United States. Congress. House. Committee on Mines and Mining - 1908 - Страниц: 70
...Mr. DOUGLAS. It reads : " To make an investigation of the methods of mining, the safety of miners, the possible improvement of conditions under which mining operations are carried on, the use of explosives and electricity, the prevention of accidents, the prices of products and markets... | |
| 1910 - Страниц: 300
...especially in relation to the safety of miners and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| United States. Dept. of the Interior - 1910 - Страниц: 130
...especially in relation to the safety of miners, and the appliances best adapted to preventing accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| 1911 - Страниц: 646
...especially In relation to the safety of miners, and the appliances best adapted to preventing accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| 1947 - Страниц: 364
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
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