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Quecksilberdampfgleichrichter in Betrieb. Quecksilberdampfgleichrichter in Betrieb im Sendessal Beromnster selfphotographed original text selbst fotografiert Timberwind de Timberwind Original upload log de Brackenheim CommonsHelper de HgGleichrichter Timberwind bytes no Andere Versionen Mercury arc rectifiers