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| View Original: | Hales_Ventilator.JPG (676x1181) | |||
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| Keywords: Hales Ventilator.JPG de Hales ™ Ventilationssytem im Gefängnis Newgate en Gentleman ™s magazine 1752 1752 author PD-old-100 Original upload log page de wikipedia Hales_Ventilator JPG 2007-06-04 22 45 Ejw0851 676×1181× 512232 bytes <nowiki> Andere Versionen </nowiki> Stephen Hales Ventilation fans Fan diagrams | ||||
