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There is a page named "File:Vacuum tube multivibrator calibrating wavemeter 1920.jpg" on Wikipedia
- DescriptionVacuum tube multivibrator calibrating wavemeter 1920.jpg English: An early vacuum tube astable multivibrator oscillator, being used with a tuning...(1,448 × 590 (337 KB)) - 17:43, 3 May 2021