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| All Patents in class 29/423 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 174,609 | Mar. 07, 1876 | R. Wright | Improvement in Machines for Bending Tubing | |
 | 423,544 | Mar. 18, 1890 | W. Vanderman | Pipe bender and former | |
| 1,981,915 | Nov. 27, 1934 | A. Hormel, W. Russell | Manufacture of metal ware | ||
| 3,725,634 | Apr. 03, 1973 | K.H. Lane | Method of Forming T-slots in a Machine Tool Table | ||