Number | Name | Date | Kind |
---|---|---|---|
3163246 | Vagins et al. | Dec 1964 | |
3198270 | Horvath | Aug 1965 | |
3434552 | Bower, Jr. | Mar 1969 | |
4268582 | Hale et al. | May 1981 | |
4314616 | Rauckhorst et al. | Feb 1982 | |
4342368 | Denman | Aug 1982 | |
4356873 | Dziak | Nov 1982 | |
4489796 | Sanchez et al. | Dec 1984 | |
4527638 | Sanchez et al. | Jul 1985 | |
4696352 | Buljan et al. | Sep 1987 |
Number | Date | Country |
---|---|---|
486235 | Jun 1938 | GBX |
Entry |
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C. Fairhurst, "The Design of Rotary Drilling Bits", Mine & Quarry Engineering, p. 271 (Jun. 1954). |