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• 2010-01-22 23:22 AndreAdrian 505×432× (7120 bytes) {{Information |Beschreibung = de Forest Audion Schaltung |Quelle = US Patent 879532 Fig. 1 |Urheber = Lee de Forest |Datum = 1907 |Genehmigung = {{Bild-PD-Amtliches Werk}} |Andere Versionen = |Anmerkungen = }}