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| All Patents in class 242/576 | |||||
| Number | Date | Patentee | Title | Type | |
| 3,456,893 | Jul. 22, 1969 | A. Michelson | Expanding mandrel assembly | sheet metal | |
| 3,934,836 | Jan. 27, 1976 | D.L. Dunlap, J.H. Muhlenkamp, C.E. Huelsman | Mandrel assembly | ||