| http://www.w3.org/ns/prov#value | - Although the high voltage circuit shown in FIG. 6 is an example of a preheating system in which two transformers, namely the high voltage transformer HT and the filament transformer FT, are used and each transformer is started with a certain time lag, according to the invention, a simultaneous heating system in which a single transformer executes both functions may be also employed.
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