| Class | Subclass | Patent |
| 192 | 85.25 | 07921975 |
| 150 | 07921976 | |
| 226 | 07921977 | |
| 194 | 208 | 07921978 |
| 211 | 07921979 | |
| 198 | 379 | 07921980 |
| 390 | 07921981 | |
| 418.9 | 07921982 | |
| 419.1 | 07921983 | |
| 448 | 07921984 | |
| 463.3 | 07921985 | |
| 468.6 | 07921986 | |
| 806 | 07921987 | |
| 833 | 07921988 | |
| 836.1 | 07921989 | |
| 867.01 | 07921990 |