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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 |
| 6224381 | Educating special needs children about money An apparatus for educating special needs children about money includes a easel having a display page having ferromagnetic properties arranged to display the display page to a child and specimen money and a plurality of graphics cards having magnetic prope... | 05/01/2001 |
| 6142786 | Educating special needs children about shapes and hardware An apparatus to educate a special needs child about shapes and hardware includes a working platform having three boards that each have one of three faces. A first face has colored areas with shaped openings in the colored areas, including round openings, ... | 11/07/2000 |
| 6129550 | Educating special needs children about place settings An apparatus for educating children with special educational needs about how to set a table includes a mat having emblems thereon indicative of the locations for proper placement of a napkin, a plate, flatware and a drinking vessel. The emblems are each f... | 10/10/2000 |
