Technology / Heating: Central Heating."Patent low pressure steam heating by Berchem & Post".Woodcut from: Das Buch der Erfindungen;Gewerbe und Industrien. Publ. by F.Reuleaux. Vol. 5: Die Chemie des t鋑lichen Lebens. 8th edit.; Leipzig & Berlin(Otto Spamer) 1886.
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達志影像
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