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Braguinski, Nikita. 2018. Random Noise Generator Type 1390-B (Video).
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Braguinski, Nikita. 2018. Brüel & Kjær 2304 Level Recorder (Video).
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Image Source: Dresdner, Albert: Industrielle Vertreter der Industrie und des Handels in Wort und Bild, Berlin, 1899.

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Turner, Steven. 2012. “Introduction To Tuning Forks From The National Museum Of American History”. Smithsonian National Museum of American History. https://youtu.be/arP0Jq35dws.
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2012. “Demonstration Acoustic Siren”. Smithsonian National Museum of American History. https://www.youtube.com/watch?v=Rs7CC4pdJeM.
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2012. “Rotator Siren”. Smithsonian Institution. https://www.youtube.com/watch?v=hzoelA3Pm8E.
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2012. “Introduction To Resonance With Artifacts From The National Museum Of American History”. Smithsonian National Museum of American History. https://www.youtube.com/watch?v=Rn93ure-Fa8.
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Chladni, Ernst Florens Friedrich. 2012. “Chladni Plate Demonstration From The National Museum Of American History”. Smithsonian National Museum of American History. https://youtu.be/KEttRmu2kGk.
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Fondazione Scienza e Tecnica,. (17 August 2015AD) 2015. “Manometric Capsule, Resonance, Koenig Sound Analyzer”. Florence, Italy: Fondazione Scienza e Tecnica. https://www.youtube.com/watch?v=OHdL-65dkkY.
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Fondazione Scienza e Tecnica,. (17 August 2015AD) 2015. “Recording The Vibrations Of Tuning Forks”. Florence, Italy: Fondazione Scienza e Tecnica. https://www.youtube.com/watch?v=o7A4jyFG7hE.