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| All Patents in class 51/306 | |||||
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| Number | Date | Patentee | Title | Type | |
| 152,572 | Jun. 30, 1874 | G. Munger | Improvement in the processes for smoothing wood surfaces | sanding machines | |
| 227,402 | May 11, 1880 | J.F. Wood | Treatment of emery-wheels | grinding wheels | |