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Picture sources

  • Image copyrights 150-buehne-start, use under license of https://unsplash.com/
  • Image copyrights  150-buehne-gewinnspiel, use under license of https://unsplash.com/
  • Image copyrights 150-buehne-Jubilaeum, use under license of https://unsplash.com/
  • Image copyrights 150-jahre-tuev-nord, use under license of https://unsplash.com/
  • Image copyrights of history pictures (timeline, use under license of TÜV NORD AG). OTIS Aufzug: image copyright © OTIS GmbH Co. OHG.
  • Image copyrights 150-jubilaeum-Buch, use under license of https://unsplash.com/
  • Image copyrights 150-150-jubilaeum-Feier, use under license of https://unsplash.com/
  • Image copyrights 150-150-jubilaeum-Film, use under license of unsplash.com