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| Number | Title | Issue Date |
| 5296665 | Method of restarting a plasma arc torch using a periodic high frequency-high voltage signal A high frequency, high voltage starting circuit for a plasma arc cutting torch is operated in pulses to restart the torch if an initial arc extinguishes before the arc transfers to the workpiece. The starting circuit includes a D.C. power supply with its ... | 03/22/1994 |
