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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 |
| 4024750 | Frequency tuning system with visual display A visual tuning-aid system for aligning an electronic timepiece to a correct reference frequency is disclosed. A reference oscillator in the system provides a reference signal at a precisely fixed predetermined frequency which is, or is converted to, the ... | 05/24/1977 |
