 
                 Patent Grant
 Patent Grant
                     D421128
 D421128
                    | Number | Name | Date | Kind | 
|---|---|---|---|
| D234725 | Yamada | Apr 1975 | |
| D322483 | Kishimoto | Dec 1991 | |
| D352556 | McShirley et al. | Nov 1994 | |
| D403075 | Lie | Dec 1998 | |
| 1371044 | Malm | Mar 1921 | |
| 2631583 | Lavergne | Mar 1953 | |
| 3184156 | Welch et al. | May 1965 | |
| 4900316 | Yamamoto | Feb 1990 | |
| 5377701 | Fang | Jan 1995 |