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Hi,
here is some convertiplanes from a PDF of 1950s,as Michigan University's report;
1- by Mr. Koah C. New
2- maybe by the same guy as 1
3- by G. B. Harrick
4- by L. LePage
5- by General Electric 1944
6- maybe also by General Electric
7- maybe also by General Electric
8- maybe by Doak
here is some convertiplanes from a PDF of 1950s,as Michigan University's report;
1- by Mr. Koah C. New
2- maybe by the same guy as 1
3- by G. B. Harrick
4- by L. LePage
5- by General Electric 1944
6- maybe also by General Electric
7- maybe also by General Electric
8- maybe by Doak