| http://www.w3.org/ns/prov#value | - s such as at least one opening between its inner and outer surfaces longitudinally located along its wall portion, said inner chamber being suitably vented to the arc tube to allow readily unimpeded gaseous exchange of the constituents of the fill ingredients within the inner chamber and the arc tube, said arc tube further having a pair of thermionic electrodes sealed therein, said thermionic elec
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