Number | Date | Country | Kind |
---|---|---|---|
68/75 | Jan 1975 | CH |
Number | Name | Date | Kind |
---|---|---|---|
3586683 | Stadler et al. | Jun 1971 | |
3652569 | Stadler et al. | Mar 1972 | |
3920664 | Clemens et al. | Nov 1975 |
Number | Date | Country |
---|---|---|
769,260 | Mar 1957 | UK |
Entry |
---|
Merck Index, 8th edition, p. 14, (1968). |