Number | Date | Country | Kind |
---|---|---|---|
3084/89 | Aug 1989 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
3444164 | Luethi et al. | May 1969 | |
4256493 | Yokoyama et al. | Mar 1981 |
Number | Date | Country |
---|---|---|
165608 | Dec 1985 | EPX |
0374751 | Jun 1990 | EPX |
63-46277 | Feb 1988 | JPX |
Entry |
---|
Research Disclosure 22,519 (Jan. 1983). |