- 256 名前:774ワット発電中さん [2018/03/14(水) 21:50:13.46 ID:zDVLuOQY.net]
- >>238
Crystals Go to War 1943 Reeves Sound Laboratories; Piezoelectric Quartz Crystals for Radio https://www.youtube.com/watch?v=b--FKHCFjOM Characteristics of Crystals 1964 US Air Force Electronics Training Film https://www.youtube.com/watch?v=dUZFxMTEss0
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