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Original file (1,347 × 2,332 pixels, file size: 1.64 MB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 05:32, 11 October 2013 | 1,347 × 2,332 (1.64 MB) | Heliograph | {{Information |Description ={{en|1=An example of the modular "quad mirror" used in the Boy Scout event, "Operation On-Target". This example has a retroreflective "red dot" aimer at the top corner. The plans for this device are in the chapter "Operat... |
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