Rock drills used in South African Mines: a comparative study of noise and vibration levels Author: Phillips JI, Heyns PS, Nelson G. Source: Annals Occup Hyg. 2007;doi:10.1093/annhyg/mel082 [epubl ahead of print Babalwa Jekwa2019-03-23T23:25:54+02:00Sep 24th, 2006| Share This Page, Choose Your Platform! FacebookTwitterLinkedInWhatsappEmail