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| All Patents in class 72/163 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 636,912 | Nov. 14, 1899 | O. Mergenthaler | Machine for straightening metal stock | |
| 4,587,822 | May 13, 1986 | C.R. Bradlee | Tension leveling apparatus | ||
| 4,635,458 | Jan. 13, 1987 | C.R. Bradlee | Leveling apparatus | ||