2 VACUUM SYSTEMS - NARA - 17423768.jpg
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2 VACUUM SYSTEMS NARA 17423768, 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 VACUUM SYSTEMS
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ja
国立公文書館所蔵 2VAKUUM SYSTEMS NARA 17423768、国立公文書館所蔵 2VAKUUM SYSTEMS
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in vacuo vacuum ground state