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Patents > Inventor country : CH or DE or ES or HU or NL & Applicant type : Hermann Burkardt or INDIV & Grant date: 1920 - 1929 & CPCs : CPC B64B1/40 or CPC B64C23/005 or None

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airplane (9) · design (7) · propellers (7) · wings (5) · construction (5) · aerodynamics (4) · LTA (4) · subsystem (4) · safety (3) · Instrument (3) · Airship (3) · frame (3)
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