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| Patents for James H. Gowan | |||||
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| Number | Date | Patentee | Title | Type | |
| 285,123 | Sep. 18, 1883 | J.H. Gowan | Car Wheel Boring and Truing Machine | horizontal boring mills | |
| 287,762 | Oct. 30, 1883 | J.H. Gowan | Car Wheel Truing Machine | car wheel lathes | |