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| All Patents in class 451/268 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,281,366 | Oct. 15, 1918 | L.R. Heim | Method of Grinding Hardened Rolls | ||
| 1,644,057 | Oct. 04, 1927 | L.R. Heim | Grinding Machine | grinding machines | |
| 1,949,514 | Mar. 06, 1934 | F.W. Elstub | Machine for and method of lapping the ends of round work pieces | grinders | |