Before revision: 1930Neoprene produced for the first time in DuPont 1930s Polystyrene first produced by BASF 1931 RCA Victor introduced their vinyl-based Victrolac compound for records.
After revision: 1930Neoprene produced for the first time at DuPont 1930s Polystyrene first produced by BASF 1931 RCA Victor introduced their vinyl-based Victrolac compound for records.