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Patents > National tech categories : DE 77h or HU V/h or USPC 244/30 & Number of diagram pages: 4-8

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LTA (10) · frame (9) · airplane (9) · propulsion (9) · navigation (6) · design (6) · Whole (5) · Propellers (5) · car (4) · Construction (4) · Aerodynamics (4) · safety (3) · propeller (3)
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