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File:„Verfahren zur Ausnutzung der überschüssigen Wärme bei Gasretortenöfen“ von Otto Henig aus Tübiingen. Ungarisches Patent von 1915.jpg

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Deutsch: Ungarisches Patent von Otto Henig, Direktor der Stadtwerke Tübingen, für das „Verfahren zur Ausnutzung der überschüssigen Wärme bei Gasretortenöfen“.
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Source Stadtwerke Tübingen
Author Unknown authorUnknown author

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