Number | Name | Date | Kind |
---|---|---|---|
3553038 | Ader | Oct 1966 | |
3885059 | Komatsu et al. | May 1975 | |
4686117 | Arai et al. | Aug 1987 | |
4992309 | Omori et al. | Feb 1991 |
Number | Date | Country |
---|---|---|
2446327 | Aug 1980 | FRX |
Entry |
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Refractory Hard Metals, (eds) Schwarzkopf et al, McMillan, N.Y. 1953, pp. 63-64. |
Abstract (english): SU-3263663: Priority Date Mar. 24, 1981. |