Number | Date | Country | Kind |
---|---|---|---|
332/80 | Jan 1980 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
2945069 | Stern | Jul 1960 | |
3092665 | Wagner | Jun 1963 | |
3347932 | Chechak | Oct 1967 | |
3408414 | Surmatis | Oct 1968 | |
3624105 | Surmatis et al. | Nov 1971 | |
4049669 | Lam et al. | Sep 1977 | |
4122123 | Hestermann et al. | Oct 1978 |
Entry |
---|
Zimmerman et al., J.A.C.S. 975497-5507 (1975). |