"Dortmunder Stadtwerke AG is a municipal services and public transport company in Dortmund, wholly owned by the city of Dortmund. It is operating under the brand ...
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DSW21 since 2005. The number in the acronym refers to the 21st century.
The development of the company began on June 19, 1857, when the Dortmunder Actien-Gesellschaft für Gasbeleuchtung was founded." - (en.wikipedia.org 13.01.2022)
