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| All Patents in class 254/DIG.4 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 272,899 | Feb. 27, 1883 | E. Prescott | Lifting Jack | ||
| 2,895,712 | Jul. 21, 1959 | I.V. Stovern, W.L. Vallee | Adjustable Load Support | ||