https://blog.arduino.cc/2020/03/17/designing-a-low-cost-open-source-ventilator-with-arduino/?fbclid=IwAR1t7_rcz4-VLQzwVGPCUhNSiEMfD1PYkuf5gvDb1U-2cyKKYirJwGIHbJI
https://www.3dnatives.com/impression-3d-covid-19-16032020/?fbclid=IwAR1gY4E4mxNgVZc0H7c_h0mGRIl2h9TOwYuhpjAyuLZTh1LGTa_cwqgsboI
https://www.facebook.com/groups/670932227050506/permalink/676860193124376/
https://grabcad.com/library/respirator-free-reanimation-venturi-s-valve-1?fbclid=IwAR3Jzbb65te7gWifQrfjc11ajseWI0PWdjulxyV5hbdJXdbyPxOtcGCe0RE
