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* [https://en.wikipedia.org/wiki/Electro Electro from Wikipedia]
* [https://de.wikipedia.org/wiki/Elektrotechnik Elektrotechnik – Wikipedia.de] (German) [https://en.wikipedia.org/wiki/Electrical_engineering Electrical engineering from Wikipedia]
* [https://de.wikipedia.org/wiki/Elektronik Elektronik – Wikipedia.de] (German) [https://en.wikipedia.org/wiki/Electronics Electronics from Wikipedia]
* [https://www.sarganserland-walensee.ch/KOSMOS_Experimentierbaukaesten/Elektromann/KOSMOS-Elektromann.htm KOSMOS Elektromann] by [https://de.wikipedia.org/wiki/Wilhelm_Fr%C3%B6hlich Wilhelm Fröhlich] (German)
