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 |
| 7390556 | Security element, such as a thread, strip and the like, for security documents A security element, such as a thread, strip and the like, for security documents in general, which comprises a flexible backing layer that has, on at least one face, a layer of metallic material provided with regions in which the thickness of the metal is less than ... | 06/24/2008 |