Sub Headings of 4809

4809.20.20.00 Writing paper
4809.20.40.00 Other
4809.90.20.00 Stereotype-matrix boardand mat
4809.90.40.00 Simplex
4809.90.60.00 Duplex
4809.90.71.00 Impregnated, coated or both, but not otherwise treated
4809.90.80.00 Other