205 / | HD | ELECTROLYSIS: PROCESSES, COMPOSITIONS USED THEREIN, AND METHODS OF PREPARING THE COMPOSITIONS |
775 | DF | ELECTROLYTIC ANALYSIS OR TESTING (PROCESS AND ELECTROLYTE COMPOSITION) {19} |
782 | DF | .~ For oxygen or oxygen containing compound (except water) {4} |
785.5 | .~.~ Gaseous oxygen or oxygen containing compound |