Number | Date | Country | Kind |
---|---|---|---|
06291/78 | Feb 1978 | GBX |
Number | Name | Date | Kind |
---|---|---|---|
2623906 | Gresham | Dec 1952 | |
3248432 | Riley et al. | Apr 1966 | |
3285948 | Butter | Nov 1966 | |
4133966 | Pretzer et al. | Jan 1979 | |
4150246 | Taylor | Apr 1979 |
Number | Date | Country |
---|---|---|
951506 | Mar 1964 | GBX |
Entry |
---|
Wender et al., "Science," vol. 113 (1951), pp. 206-207. _ |