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Hi,
Mr. William Fredrick Gergardt designed and built a helicopter or a
gyroplane in 1930s,it had a large diameter propeller,that designer
has a multi-wing aircraft,we spoke about it before.
page 285;
Mr. William Fredrick Gergardt designed and built a helicopter or a
gyroplane in 1930s,it had a large diameter propeller,that designer
has a multi-wing aircraft,we spoke about it before.
page 285;
Flying Magazine
books.google.com.eg
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