| 1/00 | Chemical treatment prior to tanning |
| 1/02 | Chemical treatment prior to tanning Curing raw hides |
| 1/04 | Chemical treatment prior to tanning Soaking |
| 1/06 | Chemical treatment prior to tanning Facilitating unhairing, e.g. by painting, by liming |
| 1/08 | Chemical treatment prior to tanning Deliming; Bating; Pickling; Degreasing |
| 3/00 | Tanning; Compositions for tanning |
| 3/02 | Tanning; Compositions for tanning Chemical tanning |
| 3/04 | Tanning; Compositions for tanning Chemical tanning Mineral tanning |
| 3/06 | Tanning; Compositions for tanning Chemical tanning Mineral tanning using chromium compounds |
| 3/08 | Tanning; Compositions for tanning Chemical tanning by organic agents |
| 3/10 | Tanning; Compositions for tanning Chemical tanning by organic agents Vegetable tanning |
| 3/12 | Tanning; Compositions for tanning Chemical tanning by organic agents Vegetable tanning using purified or modified vegetable tanning agents |
| 3/14 | Tanning; Compositions for tanning Chemical tanning by organic agents Fat tanning; Oil tanning |
| 3/16 | Tanning; Compositions for tanning Chemical tanning by organic agents using aliphatic aldehydes |
| 3/18 | Tanning; Compositions for tanning Chemical tanning by organic agents using polycondensation products or precursors thereof |
| 3/20 | Tanning; Compositions for tanning Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated |
| 3/22 | Tanning; Compositions for tanning Chemical tanning by organic agents using polymerisation products |
| 3/24 | Tanning; Compositions for tanning Chemical tanning by organic agents using lignin derivatives, e.g. sulfate liquor |
| 3/26 | Tanning; Compositions for tanning Chemical tanning by organic agents using other organic substances, containing halogen |
| 3/28 | Tanning; Compositions for tanning Chemical tanning Multi-step processes |