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Patents > Patent agent : J. S. Alford or Victor J. Evans & Number of diagram pages: 3-4

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Robert P. Hall (2) · George Lehberger (2)
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None (14) · rudder (8) · frame (7) · airplane (6) · stability (6) · navigation (5) · hybrid (5) · propulsion (4) · propeller (4) · airship (3) · safety (3) · LTA (3) · helicopter (3) · wheels (2) · marine (2) · fuselage (2) · landing (2) · balloon (2) · flapping (2)
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