A shield for improving the wear resistance and life of holding support blocks for cylindrical carbide-tipped cutting bits used in drum pulverizer and wheel machines of the type used for pulverizing and cutting refractory materials is disclosed. The shield includes a short cylindrical metal container...http://www.google.de/patents/US4932723?utm_source=gb-gplus-sharePatent US4932723 - Cutting-bit holding support block shield
