| Number | Date | Country | Kind |
|---|---|---|---|
| 0109/88 | Jan 1988 | DKX |
| Number | Name | Date | Kind |
|---|---|---|---|
| D268493 | Mitchell et al. | Apr 1983 | |
| D282067 | Inaba | Jan 1986 | |
| 4016388 | Golbeck et al. | Apr 1977 | |
| 4123641 | Murata | Oct 1978 | |
| 4352967 | Buchtel | Oct 1982 | |
| 4355211 | Steiner | Oct 1982 | |
| 4482791 | Rendgen | Nov 1984 | |
| 4501936 | Morse | Feb 1985 |