(under subclass 415) Subject matter either (a) comprising a walled or screened partial enclosure intended to be positioned generally behind, beside, or above a baseball batter in order to limit or intercept the travel of a projectile which has been pitched or hit to the rear, sides, or above the batter for protecting persons or things outside the area bounded by the partial enclosure, the partial enclosure being open in at least an area generally in front of the batter or (b) comprising a walled or screened full enclosure which does not bound or enclose a playing field or court and within which a batter stands while practicing batting a projectile.
