| 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 |