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Patents > Office : DE or HU or UN & National tech categories : DE 77h.6 or HU V/h & Number of text pages: 1

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propeller (20) · Airplane (15) · Subsystem (12) · Airship (11) · Frame (10) · Construction (9) · Propulsion (8) · Propellers (8) · design (8) · LTA (6) · aerodynamics (5) · stability (5) · wings (4) · Balloons (4)
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