| Number | Name | Date | Kind |
|---|---|---|---|
| 3598405 | Burns | Aug 1971 | |
| 4398713 | Ellis | Aug 1983 | |
| 4508335 | Kellet et al. | Apr 1985 | |
| 4509746 | Mask | Apr 1985 | |
| 4546967 | Kecala | Oct 1985 | |
| 4669724 | Matheisen | Jun 1987 | |
| 4848740 | VanDerHoeven | Jul 1989 | |
| 4867143 | Morin | Sep 1989 |
| Number | Date | Country |
|---|---|---|
| 2639307 | Mar 1978 | DEX |
| 3533481 | Mar 1987 | DEX |
| 2185416 | Jul 1987 | GBX |
| 8803825 | Jun 1988 | WOX |
| Entry |
|---|
| AB/Back Catalog, p. 11; Hyperextension Model No. 3045. |
| The HYP/AB Device Advertised by Pacific Fitness. |