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Patents > Applicant person : Alfred E. Wunderlich or Robert Strehlau & Granted: Yes

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propellers (47) · airplane (44) · hybrid (38) · LTA (34) · propulsion (10) · rarefaction (10) · ascension (8) · Sustentation (8) · helicopter (4) · design (4) · motors (2) · ball bearings (2) · Buoyancy (2) · lift (2) · instrument (2) · compartments (2) · airship (2) · gliders (2)
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