Penn Jillette of Penn and Teller fame has patented a "Hydro-Therapeutic Stimulator", which uses a hot tub for stimulation.
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| Number | Title | Issue Date |
| 4169582 | Message delivery device The base section of an upstanding, telescoping mast is fixedly anchored in respect to the ground and the top section is vertically adjustable in respect to the base section. A plurality of horizontally disposed swing arms are pivotally supported in spaced... | 10/02/1979 |