HELICOPTER TRIAL
(DNITEB TRESS ASSOCIATION.—COPYRIGHT.) (AUSTRALIAN - NEW ZEALAND CABLE ASSBCIATION.) NEW YORK, 22nd February. At Dayton, Ohio, as the result of authenticated experiments conducted by the United States Air Service, a helicopter, invented by Dr. Debotheza&t, rose vertically fifteen feet and remained virtually stationary in the air 155 seconds and descended -vertically.
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https://paperspast.natlib.govt.nz/newspapers/EP19230223.2.72
Bibliographic details
Evening Post, Volume CV, Issue 46, 23 February 1923, Page 7
Word Count
52HELICOPTER TRIAL Evening Post, Volume CV, Issue 46, 23 February 1923, Page 7
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