| More topics under "C22 - Metallurgy; Ferrous or non-ferrous alloys; Treatment of alloys or non-ferrous metals" (287,416) |
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| C22B - Production or refining of metals; Pretreatment of raw materials (93,900) |
| C22C - Alloys (170,995) |
| C22F - Changing the physical structure of non-ferrous metals or non-ferrous alloys (22,521) |