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| Patents for John P. Holt | |||||
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| Picture | Number | Date | Patentee | Title | |
| 70,213 | Oct. 29, 1867 | J.P. Holt | Steam Gauge | ||
 | 129,958 | Jul. 30, 1872 | J.P. Holt | Improvement in Registering Steam-Gauges | |
| 219,640 | Sep. 16, 1879 | J.P. Holt | Portable Forge | ||
 | 280,824 | Jul. 10, 1883 | J.P. Holt | Portable forge | |
 | 394,857 | Dec. 18, 1888 | J.P. Holt | Anvil and vise attachment | |
 | CA-31,850 | Aug. 01, 1889 | J.P. Holt | Combined anvil and vise | |