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| All Patents in class 74/424.86 | |||||
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| Number | Date | Patentee | Title | Type | |
| 601,451 | Mar. 29, 1898 | H.M. Stevenson | Lifting-jack | screw jacks | |
| 610,044 | Aug. 30, 1898 | D. Glenn | Ball-bearing screw-jack | screw jacks | |