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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 5921927 | Positioning method and apparatus for X-ray tomography A method and apparatus accurately positions the apparatus at a selected cranial implant site for x-ray tomography of the mandible and/or maxilla and the temporomandibular joint. The method and apparatus comprise making a stent of the mandible and/or maxil... | 07/13/1999 |
