| 摘要 |
<p>PROBLEM TO BE SOLVED: To assure the point which may be opened to amplify sound volume even if an object is placed on a topboard. SOLUTION: The keyboard instrument, such as, for example, an upright piano, has an upper panel assembly 14 opened to increase the sound volume of the musical instrument. The upper panel assembly 14 is connected to a fallboard assembly 8 and is so arranged as to be opened and closed cooperatively with the movement of the fallboard assembly 8 as the fallboard assembly is opened and closed.</p> |
