Information Circular, Issues 7430-7439U.S. Department of the Interior, Bureau of Mines, 1948 - Mine safety |
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bell cranks blasting Bunker fuel oil Bureau of Mines cage or skip caking Calorific value carbonizing zone coal charged coal per day coal tar coke combustion construction corrosion Cresol Crude D.C. Approvals device diamond drilling dust Electric equipment explosives extinguish Figure fire area gallons gasoline Goodman Manufacturing guides heat hoisting rope Hokkaido holes inches installed issued Japan Jeffrey Manufacturing Joy Manufacturing Karafuto Knowles ovens Koppers Koppers ovens lamp liquid fuels liquid products loading machine locomotive low-temperature carbonization lower Lurgi carbonizers magazine material method middle-oil Motor gasoline Naihoro ND ND ND Nenryo Kogyo K.K. Nissan Ekitai Nenryo operation percent Primacord pump retort rope socket safety catches safety dogs semicoke shaft shaker conveyor shortwall mining machine steel stope storage sulfur Sullivan Machinery surface Takamatsu Teikoku Nenryo Kogyo temperature Toho tons of coal truck Type unit vertical volts Vulcan iron Wanishi yield Yubari