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 |
| 4933884 | Method of and apparatus for determining threshold values for the analysis of particles contained in a liquid The apparatus for analyzing particles in a particle containing fluid, especially pretreated liquids containing blood samples, contains storage devices and computing sections for determining separation threshold values and the particle distribution as a fu... | 06/12/1990 |
| 4469005 | Marine firing weapon for fighting airborne targets, especially in zenith A marine firing or weapon system is disclosed for fighting rapidly moving targets in zenith and possesses an azimuth or lateral alignment axis which is inclined through about 35°. The ammunition infeed is accomplished from four stationary drum magazines ... | 09/04/1984 |