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 Geneva had access to a Pneumatic Tube Mail system with 10 stations and a tube length of 4,000 meters.
Reference letter Mix & Genest - 20 October 1926Reference list Mix & Genest - published June 1927Pneumatic City Mail map of Geneva (Mix & Genest)Pneumatic Tube Postoffice Geneva MontBlanc (Mix & Genest)Pneumatic Tube Engine Room Geneva (Mix & Genest)
Pneumatic Tube, Rohrpost, Buizenpost