Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7247778 | Addressable pneumatic valve system An addressable valve system is described wherein a plurality of valves are embedded into a single, compact valve block. Each valve comprises a piston moving in a bore in the block. A magnet embedded in the piston is positioned within a coil. When energized, the coil... | 07/24/2007 |
| 6049031 | Magnetic valve system for a musical instrument A magnetic valve uses neodymium magnets to maintain itself in a state, either closed or open. Upon applying electrical signals to a coil, the valve state is changed. In the open state fluid may readily flow through the valve, whereas the closed state uses... | 04/11/2000 |
| 4704937 | Pipe organ valve The pipe organ valve is comprised of a soft flexible membrane in the form of a disk adapted to be secured to a suitable actuator such as the armature of a solenoid adjacent the center of the disk and a semi-rigid ring member secured to the perimeter of th... | 11/10/1987 |
| 4651615 | Electric valve for pipe organs An electric valve for pipe organs is adapted to be mounted within an air chest and is provided with a valve member on an armature adapted to cooperate with a valve seat surrounding an air passage in the chest leading to a pipe. The valve member is compris... | 03/24/1987 |
| 4583441 | Butterfly valve for accordions and its dynamic connection with the key In a rectangular frame on the accordion box (CA) in correspondence with a single continuous opening (2), a butterfly closure member (3) is pivotally mounted on a fulcrum, and is held in a closed position with a spring (7). A block (9), pushed forward by t... | 04/22/1986 |
| 4191084 | Automatic tracking apparatus An automatic tracking apparatus is provided for maintaining alignment of music rolls in player organs and player pianos using an improved, air pressure controlled, sensing and control device. More particularly this system incorporates an air pressure sens... | 03/04/1980 |
| 4145947 | Electro pneumatic player piano The specification discloses a pneumatic player piano which utilizes an electric motor roll drive. The roll drive is actuated by a mechanical switching arrangement which responds to the system vacuum so as to simulate the operation of a conventional air mo... | 03/27/1979 |
| 3990340 | Valve device especially for pneumatically operated player pianos and organs A valve device, especially for pneumatically operated pianos and organs, in which the valve device is interposed between a source of suction and pneumatic actuators for the keys of the instrument and under the control of a perforated paper strip. The valv... | 11/09/1976 |
