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| US4744276 | 15 Jul 1986 | 17 May 1988 | Stockrail Services Limited | Method and apparatus for producing punched tube |
| US4875274 | 19 May 1988 | 24 Oct 1989 | | Method of cutting metal stud and bending and securing same to form angel member |
| US4930384 | 23 Feb 1989 | 5 Jun 1990 | Sanko Industries Limited | Die for notching hollow tubing |
| US6240820 | 19 May 1998 | 5 Jun 2001 | Shape Corporation | Die apparatus for cutting end of bumper bar |
| US6510771 | 15 Feb 2001 | 28 Jan 2003 | Shape Corporation | Die apparatus for cutting end of bumper bar |
