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Post Info TOPIC: Katsumasa Sugiyama/Mitsubishi Heavy Industries helicopter w/ducted rotor


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Date: May 10th
Katsumasa Sugiyama/Mitsubishi Heavy Industries helicopter w/ducted rotor
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Helicopter with duct to improve speed performance...

https://worldwide.espacenet.com/patent/search/family/017146598/publication/JPH0692294A?q=%20JPH0692294A&called_by=epo.org



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