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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current06:37, 11 April 2022Thumbnail for version as of 06:37, 11 April 2022750 × 490 (38 KB)LTA (talk | contribs)

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