Number | Date | Country | Kind |
---|---|---|---|
81 01462 | Jan 1981 | FRX |
Number | Name | Date | Kind |
---|---|---|---|
2484402 | Day | Oct 1949 | |
2664341 | Kesting | Dec 1953 | |
4234446 | Ramras | Nov 1980 |
Number | Date | Country |
---|---|---|
831542 | Jan 1952 | DEX |
924689 | Mar 1955 | DEX |
6906359 | Jul 1970 | NLX |
Entry |
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Foerst, Ed., Ullmanns Encyklopadie der technischen Chemie 3rd Ed., vol. 5, Urban, Munchen, W. Germany pp. 552, 553. |