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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27/00
Rotorcraft; Rotors peculiar thereto
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B64C27/021
Rotor or rotor head construction
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B64C27/025
Rotor drives, in particular for taking off; Combination of autorotation rotors and driven rotors
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