51 DIN ISO 10494-2021 2021-07-01 English Turbines and turbine sets - Measurement of emitted airborne noise - Engineering/survey method (ISO 10494:2018) 52 DIN EN ISO 4518-2021 2021-07-01 English Metallic coatings - Measurement of coating thickness - Profilometric method (ISO 4518:2021) 53 ...