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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 |
| 6340161 | Machinery seal A seal assembly 20 for a groove 12 or seal gland in a relatively displaceable machine part 10 for sealing an axial machine part 18 extending therethrough comprises a pair of annular seal elements 30 and a support element 50 disposed between the annular el... | 01/22/2002 |
| 6193236 | Packing seal having at least two axially adjacent segment rings A packing seal is provided which is intended in particular for reciprocating piston engines and which can be placed into a circumferential groove of a piston of such a reciprocating piston engine. The packing seal includes a first segment ring (1), which ... | 02/27/2001 |
| 5261362 | Piston assembly having multiple piece compression ring A piston assembly for an internal combustion engine includes a piston having at least one annular compression ring groove within which is disposed a plurality of split piston rings. Each of the rings includes a ring gap and the rings are arranged in the g... | 11/16/1993 |
| 4358121 | Ring gap seal A ring gap seal for use on the top compression ring of a piston in an internal combustion engine, an air compressor, a fluid pump, a refrigeration pump, or a rotating shaft seal. In one embodiment, the ring gap seal comprises a lip portion adapted to be s... | 11/09/1982 |
| 3955823 | Oil ring assembly An oil ring assembly for internal combustion engine pistons including an annular split piston ring with an inner circumferential groove, a radially expandable split annular spring in the groove, and a bridging means in the groove spanning the gap between ... | 05/11/1976 |
