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| All Patents in class 248/407 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 143,538 | Oct. 07, 1873 | E.H. Smith | Improvement in adjustable ratchet-rods | |
 | 1,072,363 | Sep. 02, 1913 | C.C. Roberts | Adjustable Work Supporting Device | |
| 2,314,589 | Mar. 23, 1943 | S. Mandl | Jack Assemblage | ||