| Number | Name | Date | Kind |
|---|---|---|---|
| D319880 | Tapolcai | Sep 1991 | |
| D325634 | Sweeney, Jr. | Apr 1992 | |
| D339635 | Waterson et al. | Sep 1993 | |
| 4114608 | Russo | Sep 1978 | |
| 4425923 | Gordon et al. | Jan 1984 |
| Entry |
|---|
| DHD Diemolding Healthcare Division advertisement "The DHD Coach 4000" volumetric incentive spirometer; Copyright 1993. |