Number | Name | Date | Kind |
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D253261 | Webster | Oct 1979 | |
D361972 | Ney et al. | Sep 1995 | |
D396152 | Beermann et al. | Jul 1998 | |
3632157 | Lohr | Jan 1972 | |
3713696 | Dudley | Jan 1973 | |
4707027 | Horvath et al. | Nov 1987 | |
5492068 | McKee | Feb 1996 |