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| All Patents in class 72/389.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,327,641 | Jan. 13, 1920 | F.H. Stolp | Machine for Folding Metal Tubes | metal bending machines | |
| 1,840,237 | Jan. 05, 1932 | H.J. Leighton | Work Holder for Straightening Machines | grinding machines | |