Drilldown: Patents

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Patents > Office: US & Family year: 1913 & Number of figures: 4-6

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Inventors:
Samuel Stewart Harper (2)
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Eleanor L. Harper (2)
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None (6) · stability (6) · safety (5) · frame (4) · hybrid (4) · airplane (4) · LTA (4) · hydroaeroplane (3) · propellers (3) · propulsion (3) · whole (3) · propeller (2) · passenger (2) · adjudicated (2) · Windmill (2) · HTA (2) · helicopter (2) · landing (2) · biplane (2)
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