トランジスタの進化（レトロから最先端まで）
Schlüsselwörter
three-dimensional,
valva,
retro,
rock,
crystal,
semiconductor,
frontier,
transistor,
chips,
history,
evolution,
glasses,
amp,
aged,
analog,
amplifier,
vacuum,
electricity,
electronic,
filament,
plate,
cathode,
hot
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