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An engineer(?) or a small US company with name Nemeth (no entry in Bill Gunston's otherwise very helpful "World Encyclopaedia of Aircraft Manufacturers") developed a ramjet-driven helicopter in 1948. The information comes from Rolf Besser's book "Technik und Geschichte der Hubschrauber" volume 1 (page 122), but the author gives neither illustration nor a description.
Can anybody help?
Can anybody help?