Yazar
john r bartels
6 cilt bulundu.
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
Sayfa sayısı yok · 1985
Accidents / Equipment and supplies / Mine railroads
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
18 sayfa · 1988
Cars / Mine railroads / Safety measures / Mine railroad cars
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
12 sayfa · 1992
Equipment and supplies / Fatigue / Mine hoisting / Testing / Wire rope
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
20 sayfa · 1985
Resin Mine roof bolts / Testing
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
34 sayfa · 1990
Flywheels / Motors / Shuttle cars (Mine haulage)
John R. Bartels · U.S. Dept. of the Interior, Bureau of Mines
22 sayfa · 1987
Coal mines and mining / Mine haulage / Safety measures / Shuttle cars (Mine haulage)