Description of New York method for despatching mail between main post offices and their substations; comparison with European system; percentage of perfect operation during 1922-1928 given. (see also Compressed Air Mag., vol. 34, no. 11, Nov. 1929, pp. 2937-2940, 5 figs.)
Pneumatic tubes to expedite air mail deliveries
Aero Digest
Aero Digest ; 14 , n 6
1929
1 Fig.
Article (Journal)
English
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