| Number | Name | Date | Kind |
|---|---|---|---|
| D302774 | Murphy | Aug 1989 | |
| D327220 | Proffitt et al. | Jun 1992 | |
| D330161 | Schuh | Oct 1992 | |
| D336850 | Guillin | Jun 1993 | |
| 4113095 | Dietz et al. | Sep 1978 | |
| 5036997 | May et al. | Aug 1991 | |
| 5204130 | McDevitt et al. | Apr 1993 |
| Entry |
|---|
| Lewisystems Cat 1983, p. 20. |
| Tupperware Products, Sep. 1984, p. 9. |