Stråling og ledningsevne: industriel isolering. Vi omkranser rørene med kiselholdige jordsten. Anonym illustration fra 1925. Privat samling.(Radiation and conductibility: industrial insulation. We surround the pipes with siliceous earth bricks. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
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Udateret · Engraving
· Billed-ID: 926060
Private Collection / Bridgeman Images |
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