2 GLASS VACUUM INSULATORS - NARA - 17419426.jpg
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2 GLASS VACUUM INSULATORS NARA 17419426, US National Archives series: Photographs Relating to Agency Activities, Facilities and Personnel, Images from the National Archives and Records Administration, US National Archives location: other, 2 GLASS VACUUM INSULATORS
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ja
2 GLASS VACUUM INSULATORS NARA 17419426、米国国立公文書館所蔵:2 GLASS VACUUM INSULATORS関連写真
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insulating material in vacuo vacuum insulator ground state