Diagrams and desription of helicopter patents dating from 1768 to present; jet propulsion of helicopters. Before Helicopter Assn. (see also - n 2243 Jan 18 1952 p 66-67; Aircraft Eng v 24 n 278 Apr 1952 p 92-105)
Helicopter history
Flight
Flight ; 61 , n 2244
1952
2 pages
Article (Journal)
English
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