Discusses postal tube services in Chicago, New York, Philadelphia and St. Louis, and makes comparison with German parcel tubes.
Pneumatic tubes in the United States for mail -- German types
Rohrposten fur Brief beutel in den Vereinigten Staaten von Norda merika; deutsche Bauarten
1922
6 pages
5 Figs.
Aufsatz (Zeitschrift)
Deutsch
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