Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B64
AIRCRAFT; AVIATION; COSMONAUTICS
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B64D
EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
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35/00
Transmitting power from power plants to propellers or rotors; Arrangements of transmissions
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B64D35/04
characterised by the transmission driving a plurality of propellers or rotors
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B64D35/06
the propellers or rotors being counter-rotating
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