Number | Date | Country | Kind |
---|---|---|---|
3010855 | Mar 1980 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3562518 | Javorik | Feb 1971 | |
3615892 | Heinzelman | Oct 1971 |
Number | Date | Country |
---|---|---|
637457 | Dec 1978 | SUX |
Entry |
---|
Fishlock, "Metal Colouring", Robert Draper Ltd., 1962, pp. 197-198; 280-281. |