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| All Patents in class 451/168 | |||||
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| Number | Date | Patentee | Title | Type | |
| 414,408 | Nov. 05, 1889 | A.K. Hatteberg | Sandpapering-machine | sanding machines | |
| 3,094,815 | Jun. 25, 1963 | R.F. Pendergast | Polishing apparatus | sanding machines | |