DIN 22020-2:1998-08 Investigations of raw material in hard-coal-mining - Microscopical examination of hard coal, coke and briquettes - Part 2: Preparation of polished surface from lump material and particulate blocks
1998DIN 22020-2:1998-08 Investigations of raw material in hard-coal-mining - Microscopical examination of hard coal, coke and briquettes - Part 2: Preparation of polished surface from lump material and particulate blocks
1998DIN 22020-2:1998 Investigations of raw material in hard-coal-mining - Microscopical examination of hard coal, coke and briquettes - Part 2: Preparation of polished surface from lump material and particulate blocks