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Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B64
AIRCRAFT; AVIATION; COSMONAUTICS
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B64C
AEROPLANES; HELICOPTERS
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11/00
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
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B64C11/30
Blade pitch-changing mechanisms
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B64C11/32
mechanical
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B64C11/325
comprising feathering, braking or stopping systems
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