| http://www.w3.org/ns/prov#value | - However, the hot plate (4) and the metal plate (8) are earthed, and the filament running slidingly thereon is subjected to corona charging with corona electrodes (9') and (9) by application of such a high voltage as 5 to 25 KV. In the above drawing apparatus, the corona electrode (9') may be omitted, and in this case, earthing at the hot plate (4) is not required.
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