Wilbur G. Nelson Helicopter of 1931

hesham

hesham

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Hi,

here is an Aeroca/helicopter designed by Wilbur G, Nelson in 1931,page 32;

https://books.google.com.eg/books?id=O6hi9mOhEncC&printsec=frontcover&hl=ar&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false
 

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