| http://www.w3.org/ns/prov#value | - Moreover, even if the electrode distal ends can be temporarily observed, if foreign substance such as dust is stuck to the distal end of an electrode or if the distal end is worn and the shape thereof is not uniform, then the actual shape of the discharge beam becomes irregular so that it cannot be guaranteed that the straight line between the distal ends of the discharge electrodes will be in the
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