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| Patents for John Ernst | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 324,100 | Aug. 11, 1885 | J. Ernst | Boring machine | |
 | 342,688 | May 25, 1886 | J. Ernst | Boring-machine | |
| 349,032 | Sep. 14, 1886 | J. Ernst | Vise | ||
 | 370,937 | Oct. 04, 1887 | J. Ernst | Vise | |
 | 434,541 | Aug. 19, 1890 | J. Ernst | Vise | |