CATHODE HEATER - NARA - 17420882.jpg
en
CATHODE HEATER NARA 17420882, 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, CATHODE HEATER
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ja
国立公文書館所蔵の画像:他、国立公文書館所蔵の画像:
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space heater convector cathode heater cathodic