According to a reference list - published 1927 - from the German company Mix & Genest AG, Abteilung Rohrpost und Förderanlagen in Berlin-Schöneberg, the Swiss city of Lausanne had access to a Pneumatic Tube Mail system with 3 stations and a tube length of 700 meters.
Reference letter Mix & Genest - 20 October 1926Reference list Mix & Genest - published June 1927Pneumatic City Mail map of Lausanne (Mix & Genest)
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Pneumatic Tube, Rohrpost, Buizenpost