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Magician Harry Houdini patented a "Diver's Suit" enabling the wearer to "quickly divest himself of the suit while being submerged and to safely escape and reach the surface of the water."
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| Number | Title | Issue Date |
| 4267841 | Nail matrix trephine A nail matrix trephine includes clamping head for clamping the trephine to a nail plate and a guide head for guiding a trephine cutter. The clamping head and guide head are interconnected by means of an adjustment device so that when the clamping head is ... | 05/19/1981 |
