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Control apparatus for aircraft
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Construction material for aircraft
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Wing structure for aircraft
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Air brake for aircraft
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Aircraft structure
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Propelling plant for aircraft
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Flying machine
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Rotor flying machine
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Rotor flying machine
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Folding propeller
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Rotary wing flying machine
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Rotor for helicopters
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Flying machine
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Rotor flying machine
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Improvements in or relating to aircraft of the helicopter type
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