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    • Elisa Veritti
      Keymaster
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      18 July 2017 at 15:26
      Post count: 21
      #2973 Reply |

      For the production of microchips used in our everyday electronic devices a compound of columbite and tantalite called coltan is used. Coltan is a blac
      [See the full post at: The real cost of our smartphones.]

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