| Number | Name | Date | Kind |
|---|---|---|---|
| RE26275 | Stevens | Oct 1967 | |
| 533242 | Starkweather | Jan 1895 | |
| 1266055 | Sackermann | May 1918 | |
| 1690090 | Hendricks | Oct 1928 | |
| 2019502 | Osgood | Nov 1935 | |
| 3271061 | Miller | Sep 1966 | |
| 3774945 | Lee et al. | Nov 1973 | |
| 3870352 | Engler et al. | Mar 1975 | |
| 3931934 | Smith | Jan 1976 | |
| 4012062 | Gropp, Sr. | Mar 1977 | |
| 4093690 | Murray | Jun 1978 | |
| 4099688 | Jayne | Jul 1978 | |
| 4767063 | Wall et al. | Aug 1988 |
| Entry |
|---|
| "Car Device Spreads Grit on Icy Roads", The Washington Post, Feb. 11, 1961. |