DIN 45635-12:1978-03 Measurement of noise emitted by machines; Airborne noise measurement, enveloping surface method; Electrical switchgear and control gear
1978DIN 45635-12:1978-03 Measurement of noise emitted by machines; Airborne noise measurement, enveloping surface method; Electrical switchgear and control gear
1978DIN 45635-12:1978 Measurement of noise emitted by machines; Airborne noise measurement, enveloping surface method; Electrical switchgear and control gear