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Hi,
the Germany designer Lorenzen created in 1909 a strange helicopter concept
by its time,no more info is available.
http://flyingmachines.ru/Site2/Crafts/Craft28978.htm
the Germany designer Lorenzen created in 1909 a strange helicopter concept
by its time,no more info is available.
http://flyingmachines.ru/Site2/Crafts/Craft28978.htm