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| Patents Granted on 1979-02-20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,139,939 | Feb. 20, 1979 | G.C. Crooks | Utility Knife | utility knives | |
| 4,140,098 | Feb. 20, 1979 | R.W. Sawin | Indexable Head Diamond Dressing Tool | grinder dressers | |
| 4,140,308 | Feb. 20, 1979 | H.C. Disston, Jr., T.J. Eichfeld | Work hold-down improvements | drill press accessories | |