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Patents > IPCs : IPC B63H1/12 or IPC B64C27/04 & Number of diagram pages: 2-10

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Office:
Inventors:
Édouard-Jean Bigourdan (5) · Alexis Beurrier (5) · None (3) · Louis Lacoin (3) · Louis-Marie Le Dantec (2)
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Applicant person:
Alexis Beurrier (5) · None (4) · Édouard-Jean Bigourdan (3) · Louis Lacoin (3) · Louis-Marie Le Dantec (2)
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Tech fields:
helicopter (23) · propellers (11) · propulsion (10) · Airplane (8) · hybrid (7) · ascension (6) · Propeller (5) · heavier-than-air (5) · None (5) · descent (2) · HTA (2) · navigation (2) · stability (2) · steering (2) · landing (2) · design (2) · wheels (2) · braking (2) · control (2) · frame (2)
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None (5)
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Citations from after 1930:
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