| 摘要 |
<p>A ball game amusement device for two contestants comprises a playing field beneath a transparent cover and a ball that is sent back and forth across the field by a projector for each player. The central portion of the ball field can be raised to catch and retain the ball between the ball field and the underside of the transparent panel, and a power-driven rotating cam raises the central portion of the ball field at the end of play.</p> |
