NC license, good details.
https://civilpedia.org/p/?pid=338&t=p&h=HandyVent%20-%20An%20Easy-To-Build%20Ventilator&fbclid=IwAR36c2JgiiOpX3Mg_Bn34OH3kjxETr3VHjFviKlJwsZoEwv0m0O6sjr4l9Y
