Number | Date | Country | Kind |
---|---|---|---|
3321/86 | Aug 1986 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
3454673 | Schmidt et al. | Jul 1969 | |
4233220 | Kvita et al. | Nov 1980 | |
4267232 | Schmidt et al. | May 1981 | |
4446301 | Belote et al. | May 1984 |
Entry |
---|
Derwent Abstract 56967t of U.S.S.R. Patent No. 318,227 (1972). |
CA 93:133328e (1980). |