Based on so-called single-tube system with change-of-air operation, that is, compressed air is used in transmission of mail boxes in one direction, and suction air for other direction; system arranged for semi-automatic operation.
Pneumatic mail tubes in railway repair shop at Schwerte, Germany
Die Rohrpostanlage im Eisenbahnausbesserungswerk Schwerte
Organ fur die Fortschritte des Eisenbahnwesens ; 81 , n 22
1926
2 pages
3 Figs.
Article (Journal)
German
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