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Death Whistle files used in the video:
https://www.thingiverse.com/thing:397...
https://www.thingiverse.com/thing:266...
https://www.thingiverse.com/thing:175...
https://cults3d.com/en/3d-model/vario...

Paper on Death Whistles: https://ijettjournal.org/assets/Volum...

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