DIFF Subgroup
C01B 33/325 Full Title
Silicon; Compounds thereof ( C01B21/00, C01B23/00 take precedence; persilicates C01B15/14; carbides C01B32/956) > Silicates (persilicates C01B15/14 ) > Alkali metal silicates ( , C01B33/26 take precedence)