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| All Patents in class 451/341 | |||||
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| Number | Date | Patentee | Title | Type | |
| 282,225 | Jul. 31, 1883 | J. Rentz | Grinding-Machine | grinding machines | |
| 399,066 | Mar. 05, 1889 | C.S. McMillan | Saw-gummer | saw gummers | |
| 555,586 | Mar. 03, 1896 | S.C. Schofield | Frame for grindstones | sharpening machines | |
| 1,180,448 | Apr. 25, 1916 | C.E. Shields | Power-grinder | grindstone frames | |
| 1,210,145 | Dec. 26, 1916 | L.V. Calhoun | Folding grindstone-frame | grindstone frames | |