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| Patents for Frederick Harbers | |||||
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| Number | Date | Patentee | Title | Type | |
| 891,251 | Jun. 23, 1908 | F. Harbers | Floor-sandpapering machine | sanding machines | |
| 932,466 | Aug. 31, 1909 | F. Harbers | Planing and sanding machine | sanding machines | |