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Patents > National tech categories : CH 129b or USPC 244/49 & Number of text pages: 1-2

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airplane (12) · stability (7) · automatic stability (6) · whole (5) · subsystem (5) · propeller (4) · frame (4) · airfoil (3) · heavier-than-air (3) · Tragfläche (3) · None (2) · propulsion (2) · flapping (2) · Design (2) · Construction (2) · biplane (2)
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