Image source for Impact

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Unknown. What’s happened. http://whats-happend.skynetblogs.be/archive/2009/02/02/de-stofzuiger.html (accessed March 22, 2011).

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O’Hara, Susan. Hepa Vacuum Cleaner. http://hepa-vacuumcleaners.com/ (accessed February 8, 2011).

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