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| Patents Granted on 1991-02-19 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,993,167 | Feb. 19, 1991 | D.L. Durfee, Jr. | Dressing Tool Gauge for Positioning Cutting Tools in Removable Head Type Dressers | measurement gauges | |
| 4,993,289 | Feb. 19, 1991 | J.R. Parks | Drive Element with Drive Bore Having Compound Entry Surface | ||
| 4,994,890 | Feb. 19, 1991 | D.J. Caldwell | Rectifier Structure with Individual Links | ||