|
| US4033458 | 19 Mar 1975 | 5 Jul 1977 | | Method and apparatus for cleaning shredded scrap |
| US4184640 | 5 May 1978 | 22 Ene 1980 | | Coal grinding apparatus for direct fired burners |
| US4597535 | 16 Jun 1982 | 1 Jul 1986 | Stein Industrie | Method and apparatus for regulating the operation of a crusher |
| US4747548 | 17 Nov 1986 | 31 May 1988 | Babcock-Hitachi Kabushiki Kaisha | Process for producing a high concentration coal-water slurry |
| US5405091 | 4 Ago 1993 | 11 Abr 1995 | F. L. Smidth & Co., A/S | Method for grinding of material |