Number | Name | Date | Kind |
---|---|---|---|
D223918 | Gray | Jun 1972 | |
D291350 | Sherman et al. | Aug 1987 | |
1370527 | Floriot et al. | Mar 1921 | |
2714649 | Critzer | Aug 1955 | |
3002080 | Heinzig | Sep 1961 | |
3076887 | Bulow | Feb 1963 | |
3384977 | Rosenberg | May 1968 | |
4037079 | Armbruster | Jul 1977 | |
4707933 | Keck et al. | Nov 1987 | |
4731520 | Glucksman et al. | Mar 1988 |