| http://www.w3.org/ns/prov#value | - ates the negative ions.As in this experiment, if there is a certain space provided between the ion generator 20 which generates the negative ions and the ion generator 50 which generates the positive ions when arranging the two generators, the reaction of the positiveand negative ions canceling out their effects has hardly any impact on the reaction.Fourth EmbodimentThe fourth embodiment is descri
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