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Hi,
I found this report about Helicopters and VTOL aircraft,it begins from the fifteen century,
and it is by Germany language,but I translate some of it,and it has a very little misprints,
such as Kellett K-4 and Gyrodyne GCA-5 and GCA-7,but it is good.
There is also some unknown helicopters and VTOL aircraft.
http://kulturserver-nds.de/home/hubtest/medien/ACD-allNAILS%20bis%201936.pdf
I found this report about Helicopters and VTOL aircraft,it begins from the fifteen century,
and it is by Germany language,but I translate some of it,and it has a very little misprints,
such as Kellett K-4 and Gyrodyne GCA-5 and GCA-7,but it is good.
There is also some unknown helicopters and VTOL aircraft.
http://kulturserver-nds.de/home/hubtest/medien/ACD-allNAILS%20bis%201936.pdf