| Number | Name | Date | Kind |
|---|---|---|---|
| 3993060 | Mitchell | Nov 1976 | |
| 4071024 | Blanc | Jan 1978 | |
| 4278080 | Schuch | Jul 1981 |
| Entry |
|---|
| Skin Diver, Nov. 1982, p. 49, Turbo Vent Snorkel, vol. 31/No. 5. |
| Dacor Snorkels, Model GST-The Original Big-Barrel Wrap-Around "Glo-Top".RTM. Snorkel. |