(under subclass 17) Subject matter where the lamp or discharge device is provided with a plurality of electrodes and means are provided for modifying the temperature of a plurality of the electrodes.
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19, where the envelope of the lamp or discharge device is made in whole or part of electrical conductive material.
23, where the structure includes means to circulate a fluid between the walls of a double walled envelope of a lamp or discharge device or between the envelope and the enclosing casing or jacket of a discharge device.
