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| US6948279 | 22 Abr 1997 | 27 Sep 2005 | Caldwell Manufacturing Company | Support system for laterally removable sash |
| US7367162 | 14 Dic 2004 | 6 May 2008 | Caldwell Manufacturing Company | System for shoe latching in laterally removable sash |
| US7412800 | 3 Oct 2003 | 19 Ago 2008 | | Latching and anti-bow mechanism for a window |
