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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11/00
Propellers, e.g. of ducted type; Features common to propellers and rotors for rotorcraft
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B64C11/46
Arrangements of, or constructional features peculiar to, multiple propellers
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B64C11/50
Phase synchronisation between multiple propellers
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