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| All Patents in class 279/43.7 | |||||
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| Number | Date | Patentee | Title | Type | |
| 234,624 | Nov. 16, 1880 | N. Spofford | Bit-brace | braces | |
| 5,337,521 | Aug. 16, 1994 | D. Heyl, D.M. Terpstra | Valve grinder | valve and seat maintenance | |