File:US922709 - Fig1 - Signal system.png
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US922709_-_Fig1_-_Signal_system.png (750 × 490 pixels, file size: 38 KB, MIME type: image/png)
Fig 1 from Patent US-1909-922709 showing system of magnets controlling aircraft emissions to produce signals.
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current | 06:37, 11 April 2022 | 750 × 490 (38 KB) | LTA (talk | contribs) |
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