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HThyratron. WasserstoffThyratron kV Russland Typ TGI Massstab Zahlen in cm selfphotographed Ulf Seifert Ulfbastel de Original upload log de Wdwd CommonsHelper page de HThyratron Ulfbastel bytes no Bildbeschreibung WasserstoffThyratron kV Russland Typ TGI Quelle selbst fotografiert Fotograf Ulf Seifert Datum Okt andere