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Patents > Patent agent : J. Germain or None & IPCs: IPC B64C39/00 & Number of text pages: 3-4

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airplane (10) · propulsion (8) · construction (5) · stability (5) · frame (4) · design (3) · propellers (3) · navigation (3) · whole (3) · ascension (3) · safety (2) · landing (2) · subsystem (2) · propeller (2) · parachute (2) · motors (2) · wheels (2) · lift (2) · None (2) · airship (2)
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