DIN 45635-15
DIN 45635-15
Measurement of airborne noise emitted by machines; enveloping surface method; turbogenerator sets for use in thermal power stationsstandard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1987
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1987