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Armstrong_circuit.png (679 × 488 pixels, file size: 47 KB, MIME type: image/png)

Summary

Description
English: Armstrong's "feed back" drawing that convinced the patent courts to uphold his invention.
Date before 1922
date QS:P,+1922-00-00T00:00:00Z/7,P1326,+1922-00-00T00:00:00Z/9
; drawing copied from a 1922 magazine publication
Source Radio Broadcast vol.1 no.1
Author Edwin H. Armstrong

Licensing

Public domain
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Armstrong_circuit.png

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f187b1764233736d803c6523f50372f2a8947512

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Date/TimeThumbnailDimensionsUserComment
current06:25, 31 March 2011Thumbnail for version as of 06:25, 31 March 2011679 × 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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