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| All Patents in class 474/104 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,349,964 | May 30, 1944 | L.L. Hercik | Grinding and polishing machine | metal sanding machines | |
| 3,118,314 | Jan. 21, 1964 | G.L. Schuster | Belt control | sanding machines | |