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| Patents Granted on 1981-04-21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,262,455 | Apr. 21, 1981 | R. Rettew | Head Positioning for a Belt Grinder | surface grinders | |
| 4,262,527 | Apr. 21, 1981 | J.A. Thompson, D.D. Grover | Self-Adjusting Engine Timing Pickup Probe | ||