| Number | Name | Date | Kind |
|---|---|---|---|
| D211532 | Ashton | Jun 1968 | |
| 0425768 | Ezell | Apr 1890 | |
| 1196803 | Mulholland | Sep 1916 | |
| 1688992 | Smith | Oct 1928 | |
| 1862533 | Fish, Jr. | Jun 1932 | |
| 2240020 | Raiser | Apr 1941 | |
| 2318149 | Ferman | May 1943 | |
| 2565912 | Davis | Aug 1951 | |
| 2920804 | Minton | Jan 1960 | |
| 3847324 | Uchanski et al. | Nov 1974 | |
| 3955672 | Brundage | May 1976 | |
| 4008347 | Amberg et al. | Feb 1977 | |
| 4461396 | Harper | Jul 1984 | |
| 4595611 | Quick et al. | Jun 1986 | |
| 4732274 | Bouton | Mar 1988 | |
| 5058737 | Patterson et al. | Oct 1991 | |
| 5060820 | Boerner | Oct 1991 | |
| 5240136 | Patterson et al. | Aug 1993 | |
| 5292028 | Patterson | Mar 1994 | |
| 5419454 | Stowell et al. | May 1995 | |
| 5485937 | Tseng | Jan 1996 |
| Entry |
|---|
| Camco Manufacturing, "Slip-Stop" product brochure. |