| Number | Name | Date | Kind |
|---|---|---|---|
| 2799500 | Zekowski | Jul 1957 | |
| 3272511 | Zarich | Sep 1966 | |
| 3458200 | D'elia et al. | Jul 1969 | |
| 3545758 | Payne | Dec 1970 | |
| 3656754 | Clark | Apr 1972 | |
| 3669453 | DuBois et al. | Jun 1972 | |
| 3733074 | Daley | May 1973 | |
| 3834711 | Breslow | Sep 1974 | |
| 3841637 | Piazza et al. | Oct 1974 | |
| 3853322 | Mercer | Dec 1974 | |
| 3933357 | Mercer et al. | Jan 1976 | |
| 3967825 | Anania | Jul 1976 | |
| 4848768 | Barlow | Jul 1989 | |
| 4865610 | Muller | Sep 1989 |
| Number | Date | Country |
|---|---|---|
| 1242861 | Feb 1961 | FRX |
| Entry |
|---|
| Catalog--Toys for Special Children --Enabling Devices, 1994. |
| Catalog--Able Net Inc., 1994-95 (and pp. 6-7 from another Able Net catalog). |
| Catalog--Don Johnston Incorporated, 1994. |
| Catalog--Communication Aids for Children and Adults, Crestwood Company, 1994. |
| ABLEDATA search report, Feb. 8, 1995. |