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Sesame Street - One Of These Things - Letters and numbers - YouTube
https://www.youtube.com/watch?v=Ect-kgxBb4M
The very first of the many different games.
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Flottweg Separator / Disc Stack Centrifuge - YouTube
https://www.youtube.com/watch?v=bzXUiLajVlg&context=C3ecc0a1ADOEgsToPDskIDHx0WUl90H2xwXhW9dQ9i
Disc stack centrifuges with self-cleaning bowl for solid-liquid separation are essential in many mechanical separation processes for solid-liquid separation....