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| All Patents in class 72/146 | |||||
| Number | Date | Patentee | Title | Type | |
| 475,299 | May 24, 1892 | C.J. Colling | Machine for bending sheet metal | metal bending machines | |
| 3,145,759 | Aug. 25, 1964 | A.D. Swartz, H.A. Doster, C. Zelnick | Apparatus for making power springs | ||