Number | Date | Country | Kind |
---|---|---|---|
6-078466 | Apr 1994 | JPX | |
6-083274 | Apr 1994 | JPX | |
6-136065 | Jun 1994 | JPX | |
7-006317 | Jan 1995 | JPX | |
7-006322 | Jan 1995 | JPX | |
7-006324 | Jan 1995 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2691598 | Meurice et al. | Oct 1954 | |
2724656 | Gunzelmann et al. | Nov 1955 | |
2946112 | Tucker, Jr. et al. | Jul 1960 | |
3192060 | Tilsen | Jun 1965 | |
3573940 | Cockrell et al. | Apr 1971 | |
4057398 | Bennett et al. | Nov 1977 | |
4659385 | Gostopoulos et al. | Apr 1987 | |
4770831 | Walker | Sep 1988 | |
4880582 | Spanjer et al. | Nov 1989 | |
5137753 | Bland et al. | Aug 1992 | |
5350549 | Boyle | Sep 1994 | |
5366548 | Riddle | Nov 1994 | |
5374307 | Riddle | Dec 1994 | |
5405441 | Riddle | Apr 1995 |
Number | Date | Country |
---|---|---|
0972851 | Nov 1960 | GBX |
2016241 | May 1981 | GBX |
Entry |
---|
Trace Elements In Coal, vol. II, Valkovi c, FLA. 1983, pp. 14,15 and 25-34. |