შვეულმფრენი: განსხვავება გადახედვებს შორის

 
== ლიტერატურა ==
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* {{cite book |ref=CITEREFMunson(1968) |author= Munson, Kenneth |title= Helicopters and other Rotorcraft since 1907 |location=London |publisher= Blandford Publishing |year= 1968 |isbn= 978-0-7137-0493-8}}
* {{cite book |ref=CITEREFFrancillon(1997) |author=Francillon, René J. |title= McDonnell Douglas Aircraft since 1920 |edition=Volume II |location= London |publisher= Putnam |year=1997 |isbn= 0-85177-827-5}}