205 / | HD | ELECTROLYSIS: PROCESSES, COMPOSITIONS USED THEREIN, AND METHODS OF PREPARING THE COMPOSITIONS |
775 | DF | ELECTROLYTIC ANALYSIS OR TESTING (PROCESS AND ELECTROLYTE COMPOSITION) {19} |
775.5 | .~ For corrosion {3} | |
776 | DF | .~.~> Testing by internal battery action |
776.5 | DF | .~.~> Of coating, coated substrate, or imbedded object |
777 | DF | .~.~> Of ferrous metal |