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Hi,
The Gyrodyne designed very slender coaxial helicopter
in 1956.
http://www.google.com/patents?id=9r1xAAAAEBAJ&dq=westland+helicopter&num=100&jtp=1#PPP1,M1
The Gyrodyne designed very slender coaxial helicopter
in 1956.
http://www.google.com/patents?id=9r1xAAAAEBAJ&dq=westland+helicopter&num=100&jtp=1#PPP1,M1