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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B64C27/22
Compound rotorcraft, i.e. aircraft using in flight the features of both aeroplane and rotorcraft
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B64C27/28
with forward-propulsion propellers pivotable to act as lifting rotors
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