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Manufacturing Techniques
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https://www.youtube.com/watch?v=p5JQX1BvsDI

Nanoimprint Lithography

https://www.youtube.com/watch?v=8UdNB3ZY4Ks

Etching

https://www.youtube.com/watch?v=po-nlRUQkbI

History of the Photomask

https://www.youtube.com/watch?v=Pt9NEnWmyMo