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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 |
| 6720489 | Piano muter A muter configured to be placed beneath the soundboard of a piano (in the case of a grand piano) in order to attenuate the downward transmission of sound. The muter employs blocks of acoustic foam, shaped to frictionally engage the structural elements of the piano i... | 04/13/2004 |
| 4364682 | Acoustic member mounting means for use in typewriters An acoustic member mounting means for use in typewriters and similar machines wherein the mounting means includes first and second vibration insulating means which prevents undesired sound waves from being generated in the acoustic member.... | 12/21/1982 |
