| http://www.w3.org/ns/prov#value | - The electrical resistance heating units 20 are intermittently electrically energized from a common AC power supply 36 of low frequency, e.g. less than about 1000 Hertz, during each dwell period of the intermittently indexed bar W, through respective control circuits 40 which are connected to the leads 42 from the power supply 36 and which may each include, for instance, a solid state triggering ci
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