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 66-7, Jan 25 p 92-3)
Helicopter history
Aircraft Eng
Aircraft Engineering ; 24 , n 278
1952
14 pages
Article (Journal)
English
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