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UK firm said lab tests had flagrantly discriminated against its own patented cyclone technology by testing vacuum cleaners when they were empty of dust. The UK firm said the lab tests had flagrantly discriminated against its own patented cyclone technology by testing vacuum cleaners when they were empty of dust. NegativeDyson has won a battle in the European courts over the way vacuum cleaners energy efficiency is labelled. http://www.bbc.com//news/business-461356452018-11-09