GROUP TRIMS MATERIAL SCIENCES <MSC> STAKE An investor group led by Central National-Gottesman Inc, a New York investment firm, and its executive vice president, Edgar Wachenheim, said they cut their stake in Material Sciences Corp to less than five pct. In a filing with the Securities and Exchange Commission, the group said it sold 19,500 Material Sciences common shares between Feb 11 and 19 at prices ranging from 24.00 to 27.648 dlrs a share, leaving it with 239,500 shares, or 4.7 pct. As long as the group's stake remains below five pct, it is not required to disclose further dealings in Material Sciences common stock.