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| All Patents in class 221/241 | |||||
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| Number | Date | Patentee | Title | Type | |
| 427,920 | May 13, 1890 | D.B. Shantz | Lathe for Turning Buttons | button making machinery | |
| 445,696 | Feb. 03, 1891 | E.L. Bowers, W.L. Grout | Gripping Device for Lathes | metal lathe accessories and attachments | |
| 2,554,699 | May 29, 1951 | R.M. Gamble | Gripper Transfer Device | workpiece changers and storage mechanisms | |
| 6,851,294 | Feb. 08, 2005 | B.M. Campbell, H.P. Sablowski | Clip disk assembly for carrying candle wick eyelets | ||