Number | Date | Country | Kind |
---|---|---|---|
2850243 | Nov 1978 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3256070 | Trickey | Jun 1966 | |
3925377 | Geiger | Dec 1975 |
Number | Date | Country |
---|---|---|
1545840 | Oct 1969 | DEX |
1670731 | Dec 1970 | DEX |
2332636 | Jan 1975 | DEX |
Entry |
---|
Ullmann, "Enzyklopadie der technischen Chemie", 3rd Ed. (1954), vol. 1, pp. 743-744 and 769-770, vol. 5, pp. 624-625. |