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| Patents for Union Twist Drill Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
| 286,663 | Oct. 16, 1883 | H.F. Wheeler | Grinding Machine for Producing the Relief on Twist and Fluted Drills | ||
 | 1,052,605 | Feb. 11, 1913 | S. MacKay | Grinding Machine | |
 | 1,052,649 | Feb. 11, 1913 | J.W. Boynton | Grinding Machine | |
 | 1,079,420 | Nov. 25, 1913 | S. MacKay | Method of Adjusting Rotary Cutters | |