https://phys.org/news/2018-08-university-minnesota-breakthrough-d-spinal.html
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http://trendintech.com/2017/09/01/meet-the-engineer-who-3d-prints-revolutionary-human-robotic-arms/
https://phys.org/news/2018-08-university-minnesota-breakthrough-d-spinal.html
http://trendintech.com/2017/09/01/meet-the-engineer-who-3d-prints-revolutionary-human-robotic-arms/