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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 |
| 5630047 | Method for software error recovery using consistent global checkpoints Disclosed is a method for error recovery in a multiprocessing computer system of the type in which each of the processes periodically takes checkpoints. In the event of a failure, a process can be rolled back to a prior checkpoint, and execution can conti... | 05/13/1997 |
| 5625690 | Software pay per use system A pay per use system for of the unauthorized use of computer software. An encryption program encodes original software to produce secured software. The encoding is accomplished by using cryptographic techniques. In order to use the software, a user must c... | 04/29/1997 |
