| Number | Name | Date | Kind |
|---|---|---|---|
| D27258 | Kemble | Jun 1897 | |
| D316830 | Demakas et al. | May 1991 | |
| D322214 | Davis | Dec 1991 | |
| D335535 | Arioka et al. | May 1993 | |
| 3263848 | Zackheim | Aug 1966 | |
| 3757784 | Avery | Sep 1973 | |
| 3880311 | McPhee | Apr 1975 | |
| 4687466 | Larsson | Aug 1987 | |
| 5474193 | Larsson et al. | Dec 1995 |
| Entry |
|---|
| Medala Hospital Catalogue, "Supplemental Nursing System", p. 29 prior art. |