204 / | HD | CHEMISTRY: ELECTRICAL AND WAVE ENERGY |
902 | DF | PRODUCTION OF DESIRED COMPOUND BY WAVE ENERGY IN PRESENCE OF A CHEMICALLY DESIGNATED NONREACTANT CHEMICAL TREATING AGENT (EXCLUDING WATER, CHLOROFORM, CARBON TETRACHLORIDE, METHYLENE CHLORIDE OR BENZENE) {8} |
903 | .~ Inorganic chemical treating agent {1} | |
904 | DF | .~.~> Metal treating agent {1} |