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Stingray's List of Rotorcraft -> Stingray's Rotorcraft Forum -> Patents -> Arthur Erritt Holbrook Aeroplane helicopter, 1910
Post Info TOPIC: Arthur Erritt Holbrook Aeroplane helicopter, 1910
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Date: June 2nd
Arthur Erritt Holbrook Aeroplane helicopter, 1910
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Credit to Hesham for this awesome find:

http://freepages.rootsweb.com/~cappscreek/history/aeroplane.html

https://patentimages.storage.googleapis.com/10/3a/9b/54810ad9b12be6/US1086916.pdf



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