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| All Patents in class 29/423 | |||||
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| Number | Date | Patentee | Title | Type | |
| 174,609 | Mar. 07, 1876 | R. Wright | Improvement in Machines for Bending Tubing | pipe and tube benders | |
| 3,725,634 | Apr. 03, 1973 | K.H. Lane | Method of Forming T-slots in a Machine Tool Table | metalworking machine mechanisms | |