File:Sikorsky HNS-1 (YR-4B) - GPN-2000-001729.jpg
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![File:Sikorsky HNS-1 (YR-4B) - GPN-2000-001729.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Sikorsky_HNS-1_%28YR-4B%29_-_GPN-2000-001729.jpg/800px-Sikorsky_HNS-1_%28YR-4B%29_-_GPN-2000-001729.jpg)
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Original file (3,000 × 2,175 pixels, file size: 2.7 MB, MIME type: image/jpeg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:44, 9 April 2009 | ![]() | 3,000 × 2,175 (2.7 MB) | commons>BotMultichillT | {{Information |Description={{en|1=One of Langley's Sikorsky YR-4B/HNS-1 helicopters is seen in the 30 x 60 Full Scale Tunnel. The technician is setting up camera equipment for stopped-action rotor-blade photos. Sikorsky built hundreds of R-4 helicopters d |
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