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| All Patents in class 74/409 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,487,087 | Dec. 11, 1984 | R. Johnstone | Ball Nut Having Adjustable Preload | metalworking machine mechanisms | |
| 4,554,842 | Nov. 26, 1985 | D.B. Wood, III | Anti-backlash Mechanism for Machine Drive | metalworking machine mechanisms | |