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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B64C27/16
Drive of rotors by means, e.g. propellers, mounted on rotor blades
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B64C27/18
the means being jet-reaction apparatus
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