Investigations of the raw material in hard-coal-mining; determination of the particle-size-distribution <kleiner>60 µm by ultrasonic-microsieve-analysis— 8 стр.
Investigations of the raw material in hard-coal-mining; microscopical examination of hard coal, coke and briquettes; terms, survey of processes and their applications— 7 стр.
Investigations of the raw material in hard-coal-mining; microscopical examination of hard coal, coke and briquettes; preparation of polished surface from lump material and particulate samples— 5 стр.