Number | Name | Date | Kind |
---|---|---|---|
2828711 | Smith et al. | Apr 1958 | |
3968738 | Matzke | Jul 1976 | |
4560114 | Schmidts et al. | Dec 1985 | |
4785596 | Wiley et al. | Nov 1988 | |
4875318 | MacLeod et al. | Oct 1989 | |
5349799 | Schiedegger et al. | Sep 1994 |
Entry |
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New Concept Louvers.TM., the Perfect match. (date unknown). |
Mid-America Building Products pamphlet, 1995. |