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...und in some [[Gas filled tube|electron tubes]], including [[ignitron]]s, [[thyratron]]s, and [[mercury arc rectifier]]s.<ref>{{cite book|author=Howatson A H|tit

...generation]] in [[tube-era electronics]]. Examples include a [[triode]] [[thyratron]] tube in a [[magnetic field]].<ref>{{cite web|title=World Power Systems, P