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Old 03-31-2019, 10:13 AM
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boguslaw boguslaw is offline
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Join Date: Aug 2007
Posts: 2,494
Once I spotted old patent (can't find it again) when the same amount of work in resistive heater is described to be done by replacing AC by sharp rectified AC pulses of higher voltage and higher frequency. It was a patent from 30-ties
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