PHI95122901-29DEC95-PHILADELPHIA,PENNSYLVANIA,USA. The first legalized slot machine gambling casinos opened today in Delaware after a twenty year state legislative battle. Delaware Park race track in Stanton, De and Dover Downs racetrack in Dover, De are the only venues open for slot machine gambling in the state. At Delaware Park in Stanton De, Sandy Wingo screams out as she plays a quarter slot machine on opening day December 29, 1995. .UPI lk/Laurence Kesterson