Advantages of establishment of air parcel post service; helicopter mail service; reference to tests in and around Los Angeles and New York demonstrated practicability of this means to speed up delivery of air mail to cities and towns near a metropolis. Before Am Helicopter Soc.
Helicopter in post office department
Am Helicopter
American Helicopter ; 14 , n 4
1949
3 pages
Aufsatz (Zeitschrift)
Englisch
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