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| Number | Title | Issue Date |
| 4960429 | Chromium free process for the tanning of hides A process for the tanning of skins applicable to lamb, goat, calf hides, or skins from other origins. The process is based in the previous modification of the collagen of the skin by covalent reaction with polyfunctional polymers with a high quantity of h... | 10/02/1990 |