Visnapuu, A. <br/><br/>
Noise reduction of a pneumatic rock drill 
Visnapuu, A.; Jensen, J. W. 
 - Washington  Bureau of mines  1975 
 - 23 p. 
 - RI 8082 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>MINING
<br/><br/><label>Subjects--Index Terms: </label>CONTROL DE RUIDO TALADRO DE ROCAS Noise control NOISE CONTROL ROCK-DRILLS 
<br/><br/><label>Universal Decimal Class. No.: </label>622