IPIQ

B

PERFORMING OPERATIONS; TRANSPORTING

B64

AIRCRAFT; AVIATION; COSMONAUTICS

B64C

AEROPLANES; HELICOPTERS

27/00

Rotorcraft; Rotors peculiar thereto

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B64C27/04

Helicopters

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B64C27/08

with two or more rotors

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B64C27/10

arranged coaxially

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