"There are few studies on vacuum cleaner designs and none of the vacuum cleaner users"
"In a study of three vacuum cleaners (Loopik et al. 1994) found that subjects had difficult learning how to use the different features, inappropriate gripping, unethical operation of the mechanical features, understanding how to regulate the power, adjustment of the power suction feature and difficulty understanding how to change the brush control were the most common problems experienced by the subjects'.
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