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The CIIRC RP95-3D protective half-mask was developed by a research team at the Czech Institute of Informatics, Robotics and Cybernetics CTU (CIIRC CTU) in Prague in one week. It is a personal protective device - a half-mask - with an exchangeable P3 filter that meets the highest degree of protection. The set consists of the body of the mask printed on special 3D printers and an external filter certified according to the EN 140:1999 norm and therefore meets the same or higher degree of protection as a FFP3 respirator. The CIIRC R95-3D half-mask is prepared to be used in the highest exposure clinical settings and a verified procedure exists to sterilise and disinfect it for repeated use. Therefore, it is a critical device for the protection of the lives of doctors and other front-line workers coming in contact with people who are under suspicion of or have been proven to have COVID-19.