473 / | HD | GAMES USING TANGIBLE PROJECTILE |
415 | DF | PLAYING FIELD OR COURT GAME; GAME ELEMENT OR ACCESSORY THEREFOR OTHER THAN PROJECTOR OR PROJECTILE, PER SE {14} |
422 | DF | .~ Practice or training device {7} |
423 | DF | .~.~ Tethered projectile {6} |
427 | .~.~.~ Projectile continuously driven in closed orbit prior to being struck |