|
| US3931937 | 19 Nov 1973 | 13 Ene 1976 | Pennsylvania Crusher Corporation | Breaker/crusher |
| US4011999 | 2 Jul 1975 | 15 Mar 1977 | Williams Patent Crusher and Pulzerizer Company | Self cleaning trash shredder |
| US4047673 | 9 Abr 1976 | 13 Sep 1977 | Aulmann & Beckschulte | Single-roll crusher |
| US4245790 | 21 May 1979 | 20 Ene 1981 | | Pressure relief for material shredders |
| US4339085 | 14 Abr 1980 | 13 Jul 1982 | | Reversible material reducing mill |
| US4767066 | 20 Abr 1987 | 30 Ago 1988 | Williams Patent Crusher and Pulverizer Company | Downdraft reversible hammer mill |
| US5125585 | 30 May 1991 | 30 Jun 1992 | | Reversible hammer mill with compound breaker plate adjustments |
