423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
462 | DF | HALOGEN OR COMPOUND THEREOF {10} |
491 | DF | .~ Binary compound containing metal {6} |
495 | DF | .~.~ Group IIIA metal or beryllium (Al, Ga, In, Tl, or Be) {1} |
496 | .~.~.~ Utilizing carbon or carbon containing compound |