| 1/00 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) |
| 1/02 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of light metals |
| 1/04 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of light metals in mercury cathode cells |
| 1/06 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of iron group metals, refractory metals or manganese |
| 1/08 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of iron group metals, refractory metals or manganese of nickel or cobalt |
| 1/10 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of iron group metals, refractory metals or manganese of chromium or manganese |
| 1/12 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of copper |
| 1/14 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of tin |
| 1/16 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of zinc, cadmium or mercury |
| 1/18 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of lead |
| 1/20 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of noble metals |
| 1/22 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) of metals not provided for in groups C25C 1/02-C25C 1/2 |
| 1/24 | Electrolytic production, recovery or refining of metals by electrolysis of solutions (C25C 5/00 takes precedence) Alloys obtained by cathodic reduction of all their ions |
| 3/00 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) |
| 3/02 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of alkali or alkaline earth metals |
| 3/04 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of magnesium |
| 3/06 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of aluminium |
| 3/08 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of aluminium Cell construction, e.g. bottoms, walls, cathodes |
| 3/10 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of aluminium Cell construction, e.g. bottoms, walls, cathodes External supporting frames or structures |
| 3/12 | Electrolytic production, recovery or refining of metals by electrolysis of melts (C25C 5/00 takes precedence) of aluminium Cell construction, e.g. bottoms, walls, cathodes Anodes |