Number | Name | Date | Kind |
---|---|---|---|
D142196 | Swonson et al. | Aug 1945 | |
D157332 | Bolard | Feb 1950 | |
D170451 | Drell | Sep 1953 | |
D277073 | Czech | Nov 1985 | |
D314149 | Guilbert | Jan 1991 | |
3348740 | O'Donnell | Oct 1967 | |
3430824 | Conners et al. | Mar 1969 | |
3493146 | Conners et al. | Feb 1970 | |
4773567 | Stoody | Sep 1988 |