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| Patents for Joseph Insull | |||||
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| Number | Date | Patentee | Title | Type | |
| 480,739 | Aug. 16, 1892 | H.F. Parshall | Commutator for electro-magnetic machines | motor commutators | |
| 480,740 | Aug. 16, 1892 | H.F. Parshall | Armature for dynamo-electric machines | motor armatures | |