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| All Patents of Type: portable grinding machines | |||||
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| Number | Date | Patentee | Title | Type | |
| 982,367 | Jan. 24, 1911 | W.H. Jordan | Machine for Grinding Commutators of Dynamos and Motors | commutator truing tools | |
| 1,077,306 | Nov. 04, 1913 | P.H. Root | Grinding Machine | sharpeners | |
| 1,563,712 | Dec. 01, 1925 | R. Johnson | Bearing Grinding Machine | portable grinding machines | |