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The Focke helicopter
| Author: | Focke, H. |
|---|---|
| Year: | 1938 |
| Document Type: | N/A |
| Series: | NACA Technical Memorandums |
| Report Number: | NACA-TM-858 |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc63325/ |
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