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2012. “Rotator Siren”. Smithsonian Institution. https://www.youtube.com/watch?v=hzoelA3Pm8E.
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University of Michigan,. (25 July 2014AD) 2014. “Siren Disk Demo – The Musical Scale”. Houghton, Michigan: Michigan Technological University. https://www.youtube.com/watch?v=Hpt2LWgGQwo.