DIN 45635-12:1978-Measurement Of Noise Emitted By Machines; Airborne Noise Measurement, Enveloping Surface Method; Electrical Switchgear And Control Gear 

 - Berlin :  German Institute of Standarization,  1978. 
 - 5 p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Noise measurement