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Patents > Office : CA or DE or FR & Inventor country: BE & Number of text pages: 3-70

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airplane (17) · stability (9) · Control (8) · propulsion (8) · Steering (6) · propellers (6) · Subsystem (5) · Design (5) · wings (3) · Dirigibles (3) · construction (3) · navigation (3) · rarefaction (3)
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