MICROPHONE PROBE CALIBRATION SETUP - NARA - 17423847.jpg
en
MICROPHONE PROBE CALIBRATION SETUP NARA 17423847, Microphones in 1974, 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, MICROPHONE PROBE CALIBRATION SETUP
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ja
MICROPHONE PROBE セタップ・ナラ17423847、マイクロフォン、米国国立公文書館シリーズ:活動・施設・人事関係の写真、米国国立公文書館管理局画像:他、MICROPHONE PROBE CALIBRATION SETUP
commons_translated
calibration crystal microphone cardioid microphone directional microphone condenser microphone setup probe space probe frame-up microphone