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GB753423A
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Improvements in flying machines for horizontal and vertical flight
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US2825514A
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Combined airplane-helicopter flying machine
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US2702084A
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Aircraft of the helicopter type having dual tail rotors
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US2714495A
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Aircraft with rotary deformablesection-sustaining wing
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US2702172A
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Control system for aircraft having adjustable sustaining airfoils
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CA542490A
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Aircraft propellers for combined airplane-helicopter flying machines
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CA551334A
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Combined airplane-helicopter flying machines
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CA522445A
|
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Flying machines for horizontal and vertical flight
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CA587730A
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Flying machines for vertical and horizontal flight
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