Number | Date | Country | Kind |
---|---|---|---|
2854421 | Dec 1978 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3223487 | Grosskoff | Dec 1965 |
Number | Date | Country |
---|---|---|
1143818 | Feb 1969 | GBX |
Entry |
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Testing Tube Pocketbook, Dragerwerk AG, Reprint 2340, p. 46, 5-1976. |
Gen. Chemistry; L. Pauling; 1958, p. 382, 2nd ed. |