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| All Patents in class 464/177 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,289,375 | Dec. 31, 1918 | F.E. Bright | Grinding Machine | ||
| 3,165,273 | Jan. 12, 1965 | R. Fahrbach | Toroidal coil winding apparatus | ||