辐射和导电性:工业绝缘。我们用硅质土砖包围管道。1925年的匿名插图。私人收藏。(Radiation and conductibility: industrial insulation. We surround the pipes with siliceous earth bricks. Anonymous illustration from 1925. Private collection.)匿名匿名 |
€ 99.08
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日期不详 · Engraving
· 图片ID: 926060
Private Collection / Bridgeman Images |
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