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| Patents Granted on 1977-05-10 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,021,970 | May 10, 1977 | W.C. Przygocki | Wide abrasive belt tension and oscillation assembly | sanding machines | |
| 4,022,012 | May 10, 1977 | G.W. Balz | Surface Finishing Machine | polishing and buffing machinery | |