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| All Patents in class 280/81.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 916,347 | Mar. 23, 1909 | L. Mayer | Traveling-excavator-frame structure | excavators | |
| 954,317 | Apr. 05, 1910 | D.W. Martin | Vehicle | logging trucks | |
| 1,308,537 | Jul. 01, 1919 | I.A. Weaver | Towing device | vehicle mechanic | |
| 3,756,619 | Sep. 04, 1973 | R.H. Thorsell | Adjustable wheel suspension units for vehicles | ||