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Translated from Wikipedia Svenska (article : Stomatolskylten)
The Stomatol Sign is Sweden's first animated commercial display and the oldest still working. It represents a toothbrush and a toothpaste tube of the Swedish brand Stomatol. It was first erected on November 22, 1909, on the old Katarina Elevator, in the area of Slussenområdet, Stockholm.
References
Stomatol Sign Wikipedia(Text) CC BY-SA