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| All Patents in class 451/442 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,162,038 | Jun. 13, 1939 | W. Trible | Grinding Machine | grinding machines | |
| 2,178,875 | Nov. 07, 1939 | B.A. Kearns | Continuous Truing Mechanism | grinding machines | |
| 2,184,011 | Dec. 19, 1939 | R.E. Flanders | Grinding Machine | grinder dressers | |