Citation Hunt

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The western entrance to the Teltowkanal, connecting several industrial areas of West Berlin for heavy freight transport, was blocked by East Germany in Potsdam-Klein Glienicke. Therefore, vessels going to the Teltowkanal had to take a detour via the river Spree through West and East Berlin's city centre to enter the canal from the East. On 20 November 1981, East Germany reopened the western entrance, which required two more vessel border checkpoints – Dreilinden and Kleinmachnow – because the waterway crossed the border between East Germany and West Berlin four times.^{[citation needed]}

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