Number | Name | Date | Kind |
---|---|---|---|
1642183 | Thurston | Sep 1927 | |
2052019 | Baker | Aug 1936 | |
3258284 | Phipps | Jun 1966 | |
3586353 | Lorenz | Jun 1971 | |
4295751 | Holmberg | Oct 1981 | |
4687368 | Eklof et al. | Aug 1987 |
Entry |
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"Brunner & Lay, Inc. Timken Rock Bit Division Percussion Rock Bits", Brunner and Lay, Inc. Form 022, p. 12. |
Print of Brunner & Lay, Inc. drawing showing parameters for machining trapezoidal threads on a 1.5 inch drill rod. |