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Patents > Year filed: 1916 & Office : AT or DE or ES & Applicant firm: None

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instrument (5) · engine (5) · None (4) · ICE (4) · airplane (4) · propellers (4) · propeller (4) · LTA (3) · military (3) · projectile (3) · biplane (3) · propulsion (3) · fuel (3)
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