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Baris 232: * [http://www.centennialofflight.gov/essay/Rotary/early_20th_century/HE2.htm Helicopter development in the early 20th century] * [http://www.centennialofflight.gov/essay/Dictionary/helicopter/DI27.htm Description of a helicopter] * [http://www.b-domke.de/AviationImages/Rotorhead.html http://www.b-domke.de/ Helicopter Rotorhead Gallery] <!-- interwiki -->

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