0000350440-99-000013 SC 13G 1 19990209 APPLIED EXTRUSION TECHNOLOGIES INC /DE 0000874389 3081 510295865 DE 0930 SC 13G 34 005-42039 99524689 3 CENTENNIAL DRIVE PEABODY MA 01960 9785381500 3 CENTENNIAL DR PEABODY MA 01960 SELIGMAN J & W & CO INC /NY/ 0000350440 0000 133043476 NY 1231 SC 13G 100 PARK AVENUE - 8TH FLOOR NEW YORK NY 10006 2124880200 100 PARK AVENUE 8TH FLOOR NEW YORK NY 10017 SC 13G 1 000035044099000013-001-seq1-sc-13g.txt SCHEDULE 13G