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According to a referencelist - dated 1927 - from the German company Mix & Genest AG, Abteilung Rohrpost und Förderanlagen in Berlin-Schöneberg, the Portuguese city of Lisbon had access to a Pneumatic City Mail system with two stations and a tube length of 2.500 meters.
Reference list Mix & Genest - June 1927
"Von der Mix & Genest A.-G. Abteilung Rohrpost und Förderanlagen Berlin-Schönenberg ausgeführte Stadtrohrpostanlagen"
"By Mix & Genest A.-G. Abteilung Rohrpost und Förderanlagen Berlin-Schönenberg completed Pneumatic City Mail facilities"