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Boeing Model 401 helicopter

hesham

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From, ROTARY WING AIRCRAFT HANDBOOKS AND HISTORY VOLUME 14,

they spoke about Stearman helicopter Project under design in 1943,and I know this company became a
part of Boeing before that time,but I don't know if they meant this concept or what ?.
 

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hesham

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From Boeing (Planemakers 1).
 

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