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| Patents for David I. McDonald | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,141,349 | Jul. 21, 1964 | D.I. McDonald | Ball Bearing Screw and Nut Mechanism | ||
| 3,221,404 | Dec. 07, 1965 | D.I. McDonald, W.D. Averill | Cutting Tool Adapter | ||
| 3,273,182 | Sep. 20, 1966 | D.I. McDonald | Feed Control Device to Feed Tool Spindle at Rate of Tool Advance | ||
| 3,599,279 | Aug. 17, 1971 | D.I. McDonald | Clamping Mechanism | ||
| 3,609,816 | Oct. 05, 1971 | D.I. McDonald | Hydraulic Clamping Mechanism | ||