"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 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)
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