| Number | Name | Date | Kind |
|---|---|---|---|
| D308815 | Caruso et al. | Jun 1990 | |
| 1855315 | Schacht | Apr 1932 | |
| 1902726 | Schacht | Mar 1933 | |
| 4144617 | McCarroll | Mar 1979 | |
| 4206716 | Anderson | Jun 1980 | |
| 4217944 | Pascal | Aug 1980 | |
| 4248453 | Stark | Feb 1981 | |
| 4283810 | Demrick | Aug 1981 | |
| 4295256 | Pascal | Oct 1981 | |
| 4327462 | Eggleston | May 1982 | |
| 4399586 | McCarroll | Aug 1983 | |
| 4649595 | Shane | Mar 1987 | |
| 4722115 | Yang | Feb 1988 | |
| 4911269 | Perl | Mar 1990 | |
| 5068943 | Estkowski et al. | Dec 1991 | |
| 5226739 | Estkowski et al. | Jul 1993 | |
| 5230571 | Estkowski et al. | Jul 1993 | |
| 5415252 | Estkowski | May 1995 |
| Number | Date | Country |
|---|---|---|
| 1202456 | Apr 1986 | CAX |
| Entry |
|---|
| P.J. Catalog, p. 25, caster wheel located at right of page, Apr. 1986. |
| P.J. Catalog, p. 23, caster wheel located at right of page, Apr. 1986. |
| Colson Catalog, p. 10, caster circled at left of page, Jun. 1988. |
| Saginau, p. 7, caster wheel item a located at top left of page, Mar. 1985. |