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| Patents for John P. Harrington | |||||
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| Number | Date | Patentee | Title | Type | |
| 144,966 | Nov. 25, 1873 | W.R. Davenport, J.P. Harrington, J. Elliott | Improvement in dumping-cars | railroad cars and carriages | |
| 672,552 | Apr. 23, 1901 | J.P. Harrington | Shaft-upsetting hammer | drop hammers | |