水銀遅延線で記憶保持するのは何だっけ
遅延記憶装置 - Wikipedia https://ja.wikipedia.org/wiki/%E9%81%85%E5%BB%B6%E8%A8%98%E6%86%B6%E8%A3%85%E7%BD%AE
そのまんまの名前じゃった
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