| 摘要 |
A device for ball games, sensing velocity and scoring against a damping screen comprised of areas simulating strategic plays against a player's opposition and comprised of electrical sensor means applied to the back side of the screen and of minimum mass and consisting of electrically conductive horizontal bars to be engaged by depending switch rods moved into engagement by displacement of the screen upon impact from a ball while completely absorbing impact energy, there being a plurality of bars and adjustably biased rods responsive to degrees of ball impact force, and scoring means with a display therefor.
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