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| Patents for Arthur Letherby | |||||
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| Number | Date | Patentee | Title | Type | |
| 684,433 | Oct. 15, 1901 | H.R. Isler | Differential Speed Mechanism | metal lathes | |
| 704,645 | Jul. 15, 1902 | H.R. Isler | Differential Speed Mechanism | metal lathes | |
| 802,489 | Oct. 24, 1905 | H. Baerbalck | Speed-changing device | drill presses | |