Notes on present construction and operating costs, and development from original single-line systems to duplex and multiplex-tube systems, etc.
Developments in municipal pneumatic mail-tube systems
Entsicklungsstufen im Netz-Ausbau der Stadtrohrposten
Verkehrstechnik ; 39 , n 3
1922
6 pages
2 Figs.
Article (Journal)
German
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