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Hi,I don't know what was this designation for Seversky ?,a SEV-4 ?,or it is misprint ;http://books.google.com.au/books?id=XGd6GwAACAAJ&dq=SEVERSKY+SEV-4&hl=en&sa=X&ei=UXATVL6WKcWOO6O6gEA&ved=0CBwQ6AEwAA
Hi,
I don't know what was this designation for Seversky ?,a SEV-4 ?,or it is misprint ;
http://books.google.com.au/books?id=XGd6GwAACAAJ&dq=SEVERSKY+SEV-4&hl=en&sa=X&ei=UXATVL6WKcWOO6O6gEA&ved=0CBwQ6AEwAA
