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| US4476600 | 3 Mar 1982 | 16 Oct 1984 | NATEC Institut | One-piece, washable and sterilizable plastic shoe |
| US5369895 | 26 Feb 1992 | 6 Dic 1994 | NATEC Institut fur naturwissenschaftlichtechnische Dienste | Plastic shoe with ventilation arrangement |
| US7174821 | 30 Nov 2004 | 13 Feb 2007 | Ontario Die International Inc. | Punch for a braced die |
