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Sternemann-Siebert Schraubenflieger
 
 Sterne-Sxhrau
 
A complicated helicopter with two contrarotating fabric-covered rotors of eight and six blades, built by F. Sternemann and Dr.ing. W. Siebert of Hamburg, Germany, in 1910 and tested at the Wandsbecker Exerzierplatz.
 
 
 
 


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