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| All Patents in class 451/559 | |||||
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| Number | Date | Patentee | Title | Type | |
| 408,876 | Aug. 13, 1889 | H.J. Distin | Grinding Tool | internal grinders | |
| 562,678 | Jun. 23, 1896 | C. Bodmer, J.A. Traut | Machine for Graduating Glasses or Tubes | tool making machines | |
| 686,599 | Nov. 12, 1901 | E.R. Fellows | Machine for Grinding Gear Generating Cutters | tool grinders | |
| 2,146,195 | Feb. 07, 1939 | A. Schultz | Lap | hand laps | |
| 2,160,777 | May 30, 1939 | H. Ernst, A.H. Dall | Journal Bearing | grinding machines | |