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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B64C27/37
having articulated joints
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B64C27/41
with flapping hinge or universal joint, common to the blades
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B64C27/43
see-saw type, i.e. two-bladed rotor
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