| Number | Name | Date | Kind |
|---|---|---|---|
| D176183 | Goldman et al. | Nov 1955 | |
| D179388 | Katzman et al. | Dec 1956 | |
| D224636 | Ball | Aug 1972 | |
| D224876 | Acton | Oct 1972 | |
| D242007 | Bedol | Oct 1976 | |
| D256532 | Aulenti | Aug 1980 | |
| D286715 | Schriner | Nov 1986 | |
| D292763 | Rich | Nov 1987 | |
| 313614 | Hassel et al. | Jan 1991 | |
| D321798 | Buckley | Nov 1991 | |
| D330135 | Furner et al. | Oct 1992 | |
| D334101 | Moore | Mar 1993 | |
| 2794695 | Heal | Jun 1957 | |
| 3217893 | Fleischman | Nov 1965 | |
| 3436044 | Martinson | Oct 1966 | |
| 4343245 | Edwards | Aug 1982 |
| Entry |
|---|
| J. D. Acrylics, p. 19, "Two Step Riser" at center. |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 578176 | Sep 1990 |