"Nipkow-Scheibe". DPMA.de (in German). Deutsches Patent- und Markenamt. 2 August 2019. Archived from the original on 3 August 2019. Retrieved 29 March 2020.
"Nipkow-Scheibe". DPMA.de (in German). Deutsches Patent- und Markenamt. 2 August 2019. Archived from the original on 3 August 2019. Retrieved 29 March 2020.