 
                 Patent Grant
 Patent Grant
                     6308897
 6308897
                    | Number | Name | Date | Kind | 
|---|---|---|---|
| 4566630 | Keiper | Jan 1986 | |
| 4770342 | Farrell et al. | Sep 1988 | |
| 4824015 | Farrell et al. | Apr 1989 | |
| 5104041 | Remington | Apr 1992 | 
| Entry | 
|---|
| Drawing sheet entitled “Double Pandrol Shoulder”. | 
| Four drawing sheets marked “¼” to “{fraction (4/4)}”. |