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| Patents for John Firth | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,108,264 | Aug. 25, 1914 | J. Sokolov | Wrench | screw adjust wrenches | |
| 3,336,821 | Aug. 22, 1967 | J. Firth | Control of Machine Tools | metalworking machine mechanisms | |
| 3,350,617 | Oct. 31, 1967 | J. Firth | Positioning Device for Use on Machine Tools | metalworking machine mechanisms | |