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| Patents for David Farquhar | |||||
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| Picture | Number | Date | Patentee | Title | |
| 257,994 | May 16, 1882 | D. Farquhar, R.W. Aitken | Valve Gear for Steam Engines | ||
 | 914,256 | Mar. 02, 1909 | D. Farquhar | Steam Engine | |
| 939,877 | Nov. 09, 1909 | D. Farquhar, M.J. Todd | Road Roller | ||