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| All Patents in class 451/555 | |||||
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| Number | Title | Classification(s) | |||
| 41,646 | Improved apparatus for grinding cutter-bits for rifling-machines | 451/364, 451/555, 451/558 | |||
| 609,046 | Knife or scissors sharpener | 451/45, 451/555, 76/82.2, 76/86 | |||
| 612,912 | Knife-sharpener | 451/555, 76/88 | |||
| 620,050 | Knife-sharpener | 451/555, 76/88 | |||
| 1,254,671 | Sharpener for Knives, Scissors and the Like | 451/555 | |||
| 1,269,272 | Device for Sharpening Knives, Scissors, and Like Cutting Implements | 451/555, 76/82.2 | |||
| 1,273,624 | Skate Sharpener | 451/555 | |||