Number | Date | Country | Kind |
---|---|---|---|
9816825 | Aug 1998 | GBX |
Number | Name | Date | Kind |
---|---|---|---|
4475606 | Crow | Oct 1984 | |
4694686 | Fildes et al. | Sep 1987 | |
4928521 | Jardine | May 1990 | |
5131478 | Brett et al. | Jul 1992 | |
5216917 | Detournay | Jun 1993 |
Number | Date | Country |
---|---|---|
2 125 086 | Aug 1982 | GBX |
2 241 266 | Aug 1991 | GBX |
Entry |
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J.D. Barr Optimisation of Radial Distribution of Stratapax (T1) Cutters in Rock Drilling Bits Paper presented at Energy-sources Technology Conference, New Orleans, Feb. 1980, ASME Petroleum Division. |
DBS Literature entitled "TD 13/TD 19 Drill Bit Series", undated but believed to date from about 1991 (7 Pages). |