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Special Gallery 2015
Energy Efficient Vacuum Cleaner 2.0

Matthias Justen, David Frohnau, Hans-Herbert Hornstein - Regional Contest Düsseldorf Matthias Justen, David Frohnau and Hans-Herbert Hornstein with their efficient vacuum cleaner
Miniforschung - St. Michael-Gymnasium Bad Münstereifel - Disclaimer, privacy policy, imprint