ASICC - code 21
Structure
Hierarchy
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Section: 2 - Ores, minerals, mineral fuels, lubricants, gas & electricity
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Divsion: 21 - Salts, sulpher, plasterign materials, lime & cement
Sub-division
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211 - Salts, sulpher, lime, stone, granites and marble
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213 - Gypsum, plaster
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214 - Clay, kaolin, earth, graphite, sand, quartz
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215 - Abrasive(excl. quartz)
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219 - Crude minerals