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Patents > Patent agent : Boult, Wade & Tennant or Victor J. Evans & Number of text pages: 5-6

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propulsion (3) · helicopter (3) · airplane (2) · airship (2) · stability (2) · spars (2) · Hydro-aeroplane (2) · LTA (2) · propellers (2) · propeller (2) · hybrid (2)
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