| http://www.w3.org/ns/prov#value | - In a helicopter, a sustaining and propelling rotor, a pylon having a universally pivotal connection with said rotor and suspended therefrom when the craft ,is in flight, said connection permitting the plane of the rotor to be inclined from a normal plane at right angles to the axis of said pylon, said rotor including a hub and pitch adjustable blades pivoted thereto, a swash ring having a universa
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