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Lord Kelvin, British mathematician and physicist ; 1897
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| Number | Title | Issue Date |
| 5140778 | Support and stop for hand held sander to control depth and angle of cut A portable wood sander comprising retractable interim fences to support the tool, while sanding, on the surface of an independent supporting structure, other than the surface of the work piece being sanded, and other straddling fences to stop the abrasive... | 08/25/1992 |