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| All Patents in class 451/224 | |||||
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| Number | Title | Classification(s) | |||
| 285,492 | Harvester Knife Grinder | 451/224, 451/225 | |||
| 417,001 | Automatic knife-grinder | 451/224, 451/369 | |||
| 553,828 | Grinding-machine | 29/DIG.101, 451/1, 451/224, 74/151 | |||
| 1,016,585 | Grinding-machines | 29/DIG.088, 29/DIG.101, 30/169, 451/20, 451/224, 451/380 | |||
| 2,154,999 | Composing room saw | 451/224, 451/365 | |||
| 2,754,631 | Knife grinder | 451/214, 451/224 | |||
| 5,048,236 | Saw Blade Tooth Grinder for Saws | 451/11, 451/187, 451/224, 451/293, 76/33, 76/37, 76/43, 76/77 | |||