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Application filed by Hermann ErtelfiledCriticalHermann Ertel
Publication of CH81415ApublicationCriticalpatent/CH81415A/de
Vorrichtung an Heizöfen zur Verkleinerung des Heizraumes und Verkürzung der Rostfläche zwecks Ersparnis von Brennstoff, hauptsächlich bei Zentral- und Etagenheizungen