Number | Name | Date | Kind |
---|---|---|---|
D173817 | Pavlak et al. | Jan 1955 | |
D187012 | Tweedie et al. | Jan 1960 | |
D187168 | Kimberley | Feb 1960 | |
D204180 | Helgeson | Mar 1966 | |
D341989 | Wright et al. | Dec 1993 | |
3255746 | Jenn et al. | Jun 1966 | |
3924601 | Nuss | Dec 1975 | |
4791861 | Weinkle et al. | Dec 1988 |