Last Updated：2025/12/02
Vintage Alexanderson alternators were crucial for long-distance radio communication before vacuum-tube transmitters became widespread.
See correct answer
Vintage Alexanderson alternators were crucial for long-distance radio communication before vacuum-tube transmitters became widespread.
音声機能が動作しない場合はこちらをご確認ください
Edit Histories（0）
Source Sentence
真空管送信機が普及する前、アーネスト・アレクサンダーソンが開発した交流発電機は長距離の無線通信に不可欠でした。
