File:Armstrong circuit.png
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Armstrong_circuit.png (679 × 488 pixels, file size: 47 KB, MIME type: image/png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 06:25, 31 March 2011 | 679 × 488 (47 KB) | Dicklyon | {{Information |Description ={{en|1=Armstrong's "feed back" drawing that convinced the patent courts to uphold his invention.}} |Source =Radio Broadcast vol.1 no.1 |Author =Edwin H. Armstrong |Date =before 1922; drawing copied |
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