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GB748059A
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Helicopter for towing
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US2684212A
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Disk rotor with retracting blades for convertible aircraft
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US2658576A
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Blade pitch control mechanism
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US2664958A
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Throttle control and pitch synchronizing device
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US2650046A
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Automatic control for helicopters
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US2612062A
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Main drive unit for tandem rotor helicopters
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US2520887A
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Forward rotor transmission for helicopters
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US2552864A
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Tandem rotor helicopter
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US2532483A
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Control for tandem rotored helicopters
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US2616510A
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Rotor blade damper
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US2623597A
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Rotary wing aircraft with plural rotors
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US2574980A
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Rotary wing blade
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US2518243A
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Lifting rotor blade attachment
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US2523197A
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Helicopter
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US2596818A
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Rotor blade
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US2574651A
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Sustaining rotor blade
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US2644537A
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Spar type rotor blade
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US2555577A
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Tandem rotor helicopter control
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US2507993A
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Tandem rotor helicopter
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US2595642A
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Aircraft rotor blade pitch control linkage
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