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| All Patents in class 242/573.7 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 984,809 | Feb. 21, 1911 | C.L. Goodrich | Chuck | |
| 3,456,893 | Jul. 22, 1969 | A. Michelson | Expanding mandrel assembly | ||
| 3,934,836 | Jan. 27, 1976 | J.H. Muhlenkamp, C.E. Huelsman, D.L. Dunlap | Mandrel assembly | ||