NA 062

DIN Standards Committee Materials Testing

DIN 51721 [Withdrawn] referenced in following documents:

Document number Edition Title
DIN 22011 1993-11 Investigations of the raw material in hard-coal-mining; treatment of exploratory drillings More 
DIN 22020-1 1998-08 Investigations of raw material in hard-coal-mining - Microscopical examination of hard coal, coke and briquettes - Part 1: Terms, survey of processes and their applications More