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| Patents for Arthur J. Firth | |||||
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| Number | Date | Patentee | Title | Type | |
| 644,798 | Mar. 06, 1900 | A.J. Firth | Internal Combustion Engine | diesel engines | |
| 683,459 | Oct. 01, 1901 | A.J. Firth | Valve Gear for Diesel Motor | valve gear | |
| 2,885,901 | May 12, 1959 | A.J. Firth | Machine Tool Feed Mechanism | metalworking machine mechanisms | |