Drilldown: Patents

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Patents > Year granted: 1920 - 1929 & National tech categories : HU V/h or USPC 244/7R

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airplane (26) · design (13) · construction (13) · airship (10) · Frame (9) · motors (9) · propellers (9) · aerodynamics (8) · subsystem (7) · Biplane (6) · LTA (6) · military (6) · wings (6) · safety (4)
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