(under subclass 268) Systems provided with means to apply two or more different currents and/or potential to the discharge control means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
350, and indented subclass, for other systems under the class definition having a discharge control discharge device load and being provided with means to apply two or more different currents and/or potentials to the discharge control means.
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323, Electricity: Power Supply or Regulation Systems,
227, and 291 for electronic tube regulators. See Lines With Other Classes and Within This Class in the class definition of Class 323.