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http://web.archive.org/web/20220327154828/https://spectrum.ieee.org/the-vacuum-tubes-forgotten-rival http://web.archive.org/web/20220327154828/https://spectrum.

http://web.archive.org/web/20220327154828/https://spectrum.ieee.org/the-vacuum-tubes-forgotten-rival http://web.archive.org/web/20220327154828/https://spectrum.i...