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| All Patents in class 280/503 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 738,884 | Sep. 15, 1903 | H.C. Clay | Detachable Trunnion and Supplemental Wheel for Traction Engines | ||
 | 1,537,249 | May 12, 1925 | R.E. Manley | Towing pole | |