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| All Patents in class 82/12829 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,598,077 | Aug. 31, 1926 | A.L. Halliday | Commutator Dresser | commutator truing tools | |
| 1,712,053 | May 07, 1929 | H. Shapan | Commutator-Truing Device | commutator dressing machines | |