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| Number | Title | Issue Date |
| 7275352 | Fire retardant panel door and door frame having intumescent materials therein with a 90 minute fire rating A fire retardant panel door, including a panel door having at least one door panel and stiles and rails. The door panel includes an interior composite section formed by a first plurality of layers of intumescent materials and a first plurality of layers of fire resi... | 10/02/2007 |
