| Number | Date | Country | Kind |
|---|---|---|---|
| 94 01812 | Feb 1994 | FRX | |
| 94 03659 | Mar 1994 | FRX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 1332386 | Dwyer | Mar 1920 | |
| 3651503 | Kono | Mar 1972 | |
| 3709145 | Williamson | Jan 1973 | |
| 4262591 | Cook | Apr 1981 | |
| 4347525 | Moore et al. | Aug 1982 | |
| 5168814 | Kuzuya et al. | Dec 1992 | |
| 5302034 | Kitazawa | Apr 1994 |
| Number | Date | Country |
|---|---|---|
| 0366148A2 | May 1990 | EPX |
| 0473137A2 | Mar 1992 | EPX |
| 1508988 | Apr 1978 | GBX |
| Entry |
|---|
| Patent Abstracts of Japan, vol. 7, No. 98 (M-210) Apr. 26, 1983 & JP-A-58 022 252 (Tokyo Shibaura Denki KK). |