ELECTRON GUN - NARA - 17500308.jpg
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ELECTRON GUN NARA 17500308, Electron guns, 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, ELECTRON GUN
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ja
電子銃、米国国立公文書館所蔵:活動・施設・人事関係の写真、米国国立公文書館所蔵:他、
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electron gun laity free electron electron electron shell home computer